IP classless/Default routes
Actually, I believe this is incorrect. If you enter two static default routes with the same administrative distance (in this case 1) then (depending on any configured maximum paths statement, I believe the default is 4) the router will load balance using both addresses. If the router will load balance on per-packet or per-destination basis will depend on the switching method used. The reason one of your default routes dissapear when you disconnect one of your ethernet segments is that the route to your next hop address for that default route dissapears. If a router does not have a route to the next hop address then it will not install that route into the route table even though it is statically configured. To test this scenario using your previous example try adding a static route to 10.1.1.0 255.255.255.0 with a next hop address of 10.1.2.3. When both ethernet interfaces are up you won't see that new static route for 10.1.1.3 in the table because the administrative distance for that route is 1. The router as a connected route with an administrative distance of 0 out it's ethernet interface for that network. As soon as you remove the cable from the ethernet interface with 10.1.1.1 connected to it (e0/0) the static route for 10.1.1.0 255.255.255.0 with next hop 10.1.2.3 will show up. At the same time both default statics will remain in the routing table and be used in a load sharing state. Michael Cohen CCDP, CCNP CCIE #6080 -Original Message- From: Donald B Johnson Jr [mailto:[EMAIL PROTECTED]] Sent: Tuesday, August 08, 2000 3:02 PM To: [EMAIL PROTECTED]; Dave Page Subject: IP classless/Default routes Dave Let me clear this up a little, you can place more than one default route in the routing table but the router will only use the first entry. If that link goes down the next default route will be used. Here is the config, interface Ethernet0/0 ip address 10.1.1.1 255.255.255.0 no ip directed-broadcast interface Ethernet0/1 ip address 10.1.2.1 255.255.255.0 no ip directed-broadcast Router#conf Configuring from terminal, memory, or network [terminal]? Enter configuration commands, one per line. End with CNTL/Z. Router(config)#ip routing Router(config)#ip route 0.0.0.0 0.0.0.0 10.1.1.3 Router(config)#ip route 0.0.0.0 0.0.0.0 10.1.2.3 Router(config)#^Z Router# 00:08:49: %SYS-5-CONFIG_I: Configured from console by console Router#sh ip route Codes: C - connected, S - static, I - IGRP, R - RIP, M - mobile, B - BGP D - EIGRP, EX - EIGRP external, O - OSPF, IA - OSPF inter area N1 - OSPF NSSA external type 1, N2 - OSPF NSSA external type 2 E1 - OSPF external type 1, E2 - OSPF external type 2, E - EGP i - IS-IS, L1 - IS-IS level-1, L2 - IS-IS level-2, * - candidate default U - per-user static route, o - ODR Gateway of last resort is 10.1.1.3 to network 0.0.0.0 10.0.0.0/24 is subnetted, 2 subnets C 10.1.2.0 is directly connected, Ethernet0/1 C 10.1.1.0 is directly connected, Ethernet0/0 S* 0.0.0.0/0 [1/0] via 10.1.1.3 [1/0] via 10.1.2.3 Router# Notice that the first ip route entry is the Gateway of last resort. Now watch what happens when I disconnect the cable to E0/0 Router# 00:15:20: %LINEPROTO-5-UPDOWN: Line protocol on Interface Ethernet0/0, changed s tate to down Router#sh ip route Codes: C - connected, S - static, I - IGRP, R - RIP, M - mobile, B - BGP D - EIGRP, EX - EIGRP external, O - OSPF, IA - OSPF inter area N1 - OSPF NSSA external type 1, N2 - OSPF NSSA external type 2 E1 - OSPF external type 1, E2 - OSPF external type 2, E - EGP i - IS-IS, L1 - IS-IS level-1, L2 - IS-IS level-2, * - candidate default U - per-user static route, o - ODR Gateway of last resort is 10.1.2.3 to network 0.0.0.0 10.0.0.0/24 is subnetted, 1 subnets C 10.1.2.0 is directly connected, Ethernet0/1 S* 0.0.0.0/0 [1/0] via 10.1.2.3 Router# Now notice that the second ip route entry is the Gateway of last resort. Now watch what happens when I reconnect the E0/0 cable. Router# 00:19:27: %LINEPROTO-5-UPDOWN: Line protocol on Interface Ethernet0/0, changed s tate to up Router#sh ip route Codes: C - connected, S - static, I - IGRP, R - RIP, M - mobile, B - BGP D - EIGRP, EX - EIGRP external, O - OSPF, IA - OSPF inter area N1 - OSPF NSSA external type 1, N2 - OSPF NSSA external type 2 E1 - OSPF external type 1, E2 - OSPF external type 2, E - EGP i - IS-IS, L1 - IS-IS level-1, L2 - IS-IS level-2, * - candidate default U - per-user static route, o - ODR Gateway of last resort is 10.1.2.3 to network 0.0.0.0 10.0.0.0/24 is subnetted, 2 subnets C 10.1.2.0 is directly connected, Ethernet0/1 C 10.1.1.0 is directly connected, Ethernet0/0 S* 0.0.0.0/0 [1/0] via 10.1.2.3 [1/0] via 10.1.1.3 Router# The original default gateway is now the backup route. If you want to install the first route as the one to use after the link
Re: IP classless/Default routes
I believe that is a mistake in Todd's book. You can only have one default gateway set. Otherwise the packet would not know where to send the packet. Duck - Original Message - From: Dave Page [EMAIL PROTECTED] To: 'Cisco List' [EMAIL PROTECTED] Sent: Monday, August 07, 2000 5:05 PM Subject: IP classless/Default routes In Todd Lammle's book for CCNA 640-407, on p. 202 he has set a default route of BOTH 172.16.40.2 and 172.16.20.1. How does one do this, just enter the IP route command as such, one right after the other (??): ip route 0.0.0.0 0.0.0.0 162.16.40.2 ip route 0.0.0.0 0.0.0.0 162.16.20.1 ??? The reason I ask is that in his book for CCNA 640-507, he states on page 253, "Default routing is used to send packets with a remote destination network not in the routing table to the next hop router. You can only use default routing on stub networks, which means that they have only one exit port out of the network." The two books seem to say contradictory things. Is it because the 507 exam is based on a different IOS? What gives? Dave Page ___ UPDATED Posting Guidelines: http://www.groupstudy.com/list/guide.html FAQ, list archives, and subscription info: http://www.groupstudy.com Report misconduct and Nondisclosure violations to [EMAIL PROTECTED] ___ UPDATED Posting Guidelines: http://www.groupstudy.com/list/guide.html FAQ, list archives, and subscription info: http://www.groupstudy.com Report misconduct and Nondisclosure violations to [EMAIL PROTECTED]
RE: IP classless/Default routes
Dave, If you have a CCO login check this page out. It explains the differences between Default Gateway, Gateway of last resort, and default network. If you don't have a CCO login, let me know and I will paraphrase the article. Hope this helps. http://www.cisco.com/warp/customer/105/default.html -Original Message- From: Dave Page [mailto:[EMAIL PROTECTED]] Sent: Monday, August 07, 2000 7:05 PM To: 'Cisco List' Subject:IP classless/Default routes In Todd Lammle's book for CCNA 640-407, on p. 202 he has set a default route of BOTH 172.16.40.2 and 172.16.20.1. How does one do this, just enter the IP route command as such, one right after the other (??): ip route 0.0.0.0 0.0.0.0 162.16.40.2 ip route 0.0.0.0 0.0.0.0 162.16.20.1 ??? The reason I ask is that in his book for CCNA 640-507, he states on page 253, "Default routing is used to send packets with a remote destination network not in the routing table to the next hop router. You can only use default routing on stub networks, which means that they have only one exit port out of the network." The two books seem to say contradictory things. Is it because the 507 exam is based on a different IOS? What gives? Dave Page ___ UPDATED Posting Guidelines: http://www.groupstudy.com/list/guide.html FAQ, list archives, and subscription info: http://www.groupstudy.com Report misconduct and Nondisclosure violations to [EMAIL PROTECTED] ___ UPDATED Posting Guidelines: http://www.groupstudy.com/list/guide.html FAQ, list archives, and subscription info: http://www.groupstudy.com Report misconduct and Nondisclosure violations to [EMAIL PROTECTED]
Re: IP classless/Default routes
No, there is nothing incongruous here. You add the static route for the default route which tells the router that "if you don't know where the destination is, just shove it out over here". Lammle has to use the two static route commands because router B is in the middle of two networks. So when router B doesn't know of the destination it has to shove the packet out two sides so that each of the other networks can take a look at it and decide what to do with it. It is this kind of confusion that leads to the use of synamic protocols rather than static routes. Adam Hickey [EMAIL PROTECTED] - Original Message - From: "Dave Page" [EMAIL PROTECTED] To: "'Cisco List'" [EMAIL PROTECTED] Sent: Monday, August 07, 2000 5:05 PM Subject: IP classless/Default routes In Todd Lammle's book for CCNA 640-407, on p. 202 he has set a default route of BOTH 172.16.40.2 and 172.16.20.1. How does one do this, just enter the IP route command as such, one right after the other (??): ip route 0.0.0.0 0.0.0.0 162.16.40.2 ip route 0.0.0.0 0.0.0.0 162.16.20.1 ??? The reason I ask is that in his book for CCNA 640-507, he states on page 253, "Default routing is used to send packets with a remote destination network not in the routing table to the next hop router. You can only use default routing on stub networks, which means that they have only one exit port out of the network." The two books seem to say contradictory things. Is it because the 507 exam is based on a different IOS? What gives? Dave Page ___ UPDATED Posting Guidelines: http://www.groupstudy.com/list/guide.html FAQ, list archives, and subscription info: http://www.groupstudy.com Report misconduct and Nondisclosure violations to [EMAIL PROTECTED] ___ UPDATED Posting Guidelines: http://www.groupstudy.com/list/guide.html FAQ, list archives, and subscription info: http://www.groupstudy.com Report misconduct and Nondisclosure violations to [EMAIL PROTECTED]
RE: IP classless/Default routes
In many cases, one can substitute the word "public" for "customer" and get the same info http://www.cisco.com/warp/public/105/default.html best wishes Chuck -Original Message- From: [EMAIL PROTECTED] [mailto:[EMAIL PROTECTED]] On Behalf Of [EMAIL PROTECTED] Sent: Tuesday, August 08, 2000 8:28 AM To: [EMAIL PROTECTED]; [EMAIL PROTECTED] Subject: RE: IP classless/Default routes Dave, If you have a CCO login check this page out. It explains the differences between Default Gateway, Gateway of last resort, and default network. If you don't have a CCO login, let me know and I will paraphrase the article. Hope this helps. http://www.cisco.com/warp/customer/105/default.html -Original Message- From: Dave Page [mailto:[EMAIL PROTECTED]] Sent: Monday, August 07, 2000 7:05 PM To: 'Cisco List' Subject: IP classless/Default routes In Todd Lammle's book for CCNA 640-407, on p. 202 he has set a default route of BOTH 172.16.40.2 and 172.16.20.1. How does one do this, just enter the IP route command as such, one right after the other (??): ip route 0.0.0.0 0.0.0.0 162.16.40.2 ip route 0.0.0.0 0.0.0.0 162.16.20.1 ??? The reason I ask is that in his book for CCNA 640-507, he states on page 253, "Default routing is used to send packets with a remote destination network not in the routing table to the next hop router. You can only use default routing on stub networks, which means that they have only one exit port out of the network." The two books seem to say contradictory things. Is it because the 507 exam is based on a different IOS? What gives? Dave Page ___ UPDATED Posting Guidelines: http://www.groupstudy.com/list/guide.html FAQ, list archives, and subscription info: http://www.groupstudy.com Report misconduct and Nondisclosure violations to [EMAIL PROTECTED] ___ UPDATED Posting Guidelines: http://www.groupstudy.com/list/guide.html FAQ, list archives, and subscription info: http://www.groupstudy.com Report misconduct and Nondisclosure violations to [EMAIL PROTECTED] ___ UPDATED Posting Guidelines: http://www.groupstudy.com/list/guide.html FAQ, list archives, and subscription info: http://www.groupstudy.com Report misconduct and Nondisclosure violations to [EMAIL PROTECTED]
RE: IP classless/Default routes
could be its missing it's weight i.e a weighted default gateway to prevent it dropping the packet if the interface is not up ip route 0.0.0.0 0.0.0.0 162.16.40.2 ip route 0.0.0.0 0.0.0.0 162.16.20.1 3 3 being the weight -Original Message- From: Donald B Johnson Jr [SMTP:[EMAIL PROTECTED]] Sent: Tuesday 08 August 2000 19:15 To: Dave Page; 'Cisco List' Subject: Re: IP classless/Default routes I believe that is a mistake in Todd's book. You can only have one default gateway set. Otherwise the packet would not know where to send the packet. Duck - Original Message - From: Dave Page [EMAIL PROTECTED] To: 'Cisco List' [EMAIL PROTECTED] Sent: Monday, August 07, 2000 5:05 PM Subject: IP classless/Default routes In Todd Lammle's book for CCNA 640-407, on p. 202 he has set a default route of BOTH 172.16.40.2 and 172.16.20.1. How does one do this, just enter the IP route command as such, one right after the other (??): ip route 0.0.0.0 0.0.0.0 162.16.40.2 ip route 0.0.0.0 0.0.0.0 162.16.20.1 ??? The reason I ask is that in his book for CCNA 640-507, he states on page 253, "Default routing is used to send packets with a remote destination network not in the routing table to the next hop router. You can only use default routing on stub networks, which means that they have only one exit port out of the network." The two books seem to say contradictory things. Is it because the 507 exam is based on a different IOS? What gives? Dave Page ___ UPDATED Posting Guidelines: http://www.groupstudy.com/list/guide.html FAQ, list archives, and subscription info: http://www.groupstudy.com Report misconduct and Nondisclosure violations to [EMAIL PROTECTED] ___ UPDATED Posting Guidelines: http://www.groupstudy.com/list/guide.html FAQ, list archives, and subscription info: http://www.groupstudy.com Report misconduct and Nondisclosure violations to [EMAIL PROTECTED] ___ UPDATED Posting Guidelines: http://www.groupstudy.com/list/guide.html FAQ, list archives, and subscription info: http://www.groupstudy.com Report misconduct and Nondisclosure violations to [EMAIL PROTECTED]
RE: IP classless/Default routes
I think you mean Administrative Distance. William Swedberg CCNP CCDP --- Fomes Iain [EMAIL PROTECTED] wrote: could be its missing it's weight i.e a weighted default gateway to prevent it dropping the packet if the interface is not up ip route 0.0.0.0 0.0.0.0 162.16.40.2 ip route 0.0.0.0 0.0.0.0 162.16.20.1 3 3 being the weight -Original Message- From: Donald B Johnson Jr [SMTP:[EMAIL PROTECTED]] Sent: Tuesday 08 August 2000 19:15 To: Dave Page; 'Cisco List' Subject:Re: IP classless/Default routes I believe that is a mistake in Todd's book. You can only have one default gateway set. Otherwise the packet would not know where to send the packet. Duck - Original Message - From: Dave Page [EMAIL PROTECTED] To: 'Cisco List' [EMAIL PROTECTED] Sent: Monday, August 07, 2000 5:05 PM Subject: IP classless/Default routes In Todd Lammle's book for CCNA 640-407, on p. 202 he has set a default route of BOTH 172.16.40.2 and 172.16.20.1. How does one do this, just enter the IP route command as such, one right after the other (??): ip route 0.0.0.0 0.0.0.0 162.16.40.2 ip route 0.0.0.0 0.0.0.0 162.16.20.1 ??? The reason I ask is that in his book for CCNA 640-507, he states on page 253, "Default routing is used to send packets with a remote destination network not in the routing table to the next hop router. You can only use default routing on stub networks, which means that they have only one exit port out of the network." The two books seem to say contradictory things. Is it because the 507 exam is based on a different IOS? What gives? Dave Page ___ UPDATED Posting Guidelines: http://www.groupstudy.com/list/guide.html FAQ, list archives, and subscription info: http://www.groupstudy.com Report misconduct and Nondisclosure violations to [EMAIL PROTECTED] ___ UPDATED Posting Guidelines: http://www.groupstudy.com/list/guide.html FAQ, list archives, and subscription info: http://www.groupstudy.com Report misconduct and Nondisclosure violations to [EMAIL PROTECTED] ___ UPDATED Posting Guidelines: http://www.groupstudy.com/list/guide.html FAQ, list archives, and subscription info: http://www.groupstudy.com Report misconduct and Nondisclosure violations to [EMAIL PROTECTED] = William Swedberg CCNP CCDP __ Do You Yahoo!? Kick off your party with Yahoo! Invites. http://invites.yahoo.com/ ___ UPDATED Posting Guidelines: http://www.groupstudy.com/list/guide.html FAQ, list archives, and subscription info: http://www.groupstudy.com Report misconduct and Nondisclosure violations to [EMAIL PROTECTED]
RE: IP classless/Default routes
Or you could substitute "public" for "customer" in the URL and get to it anyway. http://www.cisco.com/warp/public/105/default.html Karen E Young Network Engineer ELF Technologies, Inc [EMAIL PROTECTED] dacarl4@uswes t.comTo: [EMAIL PROTECTED], [EMAIL PROTECTED] Sent by: cc: nobody@groups Subject: RE: IP classless/Default routes tudy.com 08/08/00 08:28 AM Please respond to dacarl4 Dave, If you have a CCO login check this page out. It explains the differences between Default Gateway, Gateway of last resort, and default network. If you don't have a CCO login, let me know and I will paraphrase the article. Hope this helps. http://www.cisco.com/warp/customer/105/default.html -Original Message- From: Dave Page [mailto:[EMAIL PROTECTED]] Sent: Monday, August 07, 2000 7:05 PM To:'Cisco List' Subject: IP classless/Default routes In Todd Lammle's book for CCNA 640-407, on p. 202 he has set a default route of BOTH 172.16.40.2 and 172.16.20.1. How does one do this, just enter the IP route command as such, one right after the other (??): ip route 0.0.0.0 0.0.0.0 162.16.40.2 ip route 0.0.0.0 0.0.0.0 162.16.20.1 ??? The reason I ask is that in his book for CCNA 640-507, he states on page 253, "Default routing is used to send packets with a remote destination network not in the routing table to the next hop router. You can only use default routing on stub networks, which means that they have only one exit port out of the network." The two books seem to say contradictory things. Is it because the 507 exam is based on a different IOS? What gives? Dave Page ___ UPDATED Posting Guidelines: http://www.groupstudy.com/list/guide.html FAQ, list archives, and subscription info: http://www.groupstudy.com Report misconduct and Nondisclosure violations to [EMAIL PROTECTED] ___ UPDATED Posting Guidelines: http://www.groupstudy.com/list/guide.html FAQ, list archives, and subscription info: http://www.groupstudy.com Report misconduct and Nondisclosure violations to [EMAIL PROTECTED] ___ UPDATED Posting Guidelines: http://www.groupstudy.com/list/guide.html FAQ, list archives, and subscription info: http://www.groupstudy.com Report misconduct and Nondisclosure violations to [EMAIL PROTECTED]
IP classless/Default routes
and points. Hope this helps clear up your question, forget what the book said this is how a real router works. Not that I'm knocking Todd's book, I love his work, but there is a lot to say about trying it out. Thanks Duck - Original Message - From: Donald B Johnson Jr [EMAIL PROTECTED] To: Dave Page [EMAIL PROTECTED]; 'Cisco List' [EMAIL PROTECTED] Sent: Tuesday, August 08, 2000 11:14 AM Subject: Re: IP classless/Default routes I believe that is a mistake in Todd's book. You can only have one default gateway set. Otherwise the packet would not know where to send the packet. Duck - Original Message - From: Dave Page [EMAIL PROTECTED] To: 'Cisco List' [EMAIL PROTECTED] Sent: Monday, August 07, 2000 5:05 PM Subject: IP classless/Default routes In Todd Lammle's book for CCNA 640-407, on p. 202 he has set a default route of BOTH 172.16.40.2 and 172.16.20.1. How does one do this, just enter the IP route command as such, one right after the other (??): ip route 0.0.0.0 0.0.0.0 162.16.40.2 ip route 0.0.0.0 0.0.0.0 162.16.20.1 ??? The reason I ask is that in his book for CCNA 640-507, he states on page 253, "Default routing is used to send packets with a remote destination network not in the routing table to the next hop router. You can only use default routing on stub networks, which means that they have only one exit port out of the network." The two books seem to say contradictory things. Is it because the 507 exam is based on a different IOS? What gives? Dave Page ___ UPDATED Posting Guidelines: http://www.groupstudy.com/list/guide.html FAQ, list archives, and subscription info: http://www.groupstudy.com Report misconduct and Nondisclosure violations to [EMAIL PROTECTED] ___ UPDATED Posting Guidelines: http://www.groupstudy.com/list/guide.html FAQ, list archives, and subscription info: http://www.groupstudy.com ___ UPDATED Posting Guidelines: http://www.groupstudy.com/list/guide.html FAQ, list archives, and subscription info: http://www.groupstudy.com Report misconduct and Nondisclosure violations to [EMAIL PROTECTED]
RE: IP classless/Default routes
Actually, I believe this is incorrect. If you enter two static default routes with the same administrative distance (in this case 1) then (depending on any configured maximum paths statement, I believe the default is 4) the router will load balance using both addresses. If the router will load balance on per-packet or per-destination basis will depend on the switching method used. The reason one of your default routes dissapear when you disconnect one of your ethernet segments is that the route to your next hop address for that default route dissapears. If a router does not have a route to the next hop address then it will not install that route into the route table even though it is statically configured. To test this scenario using your previous example try adding a static route to 10.1.1.0 255.255.255.0 with a next hop address of 10.1.2.3. When both ethernet interfaces are up you won't see that new static route for 10.1.1.3 in the table because the administrative distance for that route is 1. The router as a connected route with an administrative distance of 0 out it's ethernet interface for that network. As soon as you remove the cable from the ethernet interface with 10.1.1.1 connected to it (e0/0) the static route for 10.1.1.0 255.255.255.0 with next hop 10.1.2.3 will show up. At the same time both default statics will remain in the routing table and be used in a load sharing state. Michael Cohen CCDP, CCNP CCIE #6080 -Original Message- From: Donald B Johnson Jr [mailto:[EMAIL PROTECTED]] Sent: Tuesday, August 08, 2000 3:02 PM To: [EMAIL PROTECTED]; Dave Page Subject: IP classless/Default routes Dave Let me clear this up a little, you can place more than one default route in the routing table but the router will only use the first entry. If that link goes down the next default route will be used. Here is the config, interface Ethernet0/0 ip address 10.1.1.1 255.255.255.0 no ip directed-broadcast interface Ethernet0/1 ip address 10.1.2.1 255.255.255.0 no ip directed-broadcast Router#conf Configuring from terminal, memory, or network [terminal]? Enter configuration commands, one per line. End with CNTL/Z. Router(config)#ip routing Router(config)#ip route 0.0.0.0 0.0.0.0 10.1.1.3 Router(config)#ip route 0.0.0.0 0.0.0.0 10.1.2.3 Router(config)#^Z Router# 00:08:49: %SYS-5-CONFIG_I: Configured from console by console Router#sh ip route Codes: C - connected, S - static, I - IGRP, R - RIP, M - mobile, B - BGP D - EIGRP, EX - EIGRP external, O - OSPF, IA - OSPF inter area N1 - OSPF NSSA external type 1, N2 - OSPF NSSA external type 2 E1 - OSPF external type 1, E2 - OSPF external type 2, E - EGP i - IS-IS, L1 - IS-IS level-1, L2 - IS-IS level-2, * - candidate default U - per-user static route, o - ODR Gateway of last resort is 10.1.1.3 to network 0.0.0.0 10.0.0.0/24 is subnetted, 2 subnets C 10.1.2.0 is directly connected, Ethernet0/1 C 10.1.1.0 is directly connected, Ethernet0/0 S* 0.0.0.0/0 [1/0] via 10.1.1.3 [1/0] via 10.1.2.3 Router# Notice that the first ip route entry is the Gateway of last resort. Now watch what happens when I disconnect the cable to E0/0 Router# 00:15:20: %LINEPROTO-5-UPDOWN: Line protocol on Interface Ethernet0/0, changed s tate to down Router#sh ip route Codes: C - connected, S - static, I - IGRP, R - RIP, M - mobile, B - BGP D - EIGRP, EX - EIGRP external, O - OSPF, IA - OSPF inter area N1 - OSPF NSSA external type 1, N2 - OSPF NSSA external type 2 E1 - OSPF external type 1, E2 - OSPF external type 2, E - EGP i - IS-IS, L1 - IS-IS level-1, L2 - IS-IS level-2, * - candidate default U - per-user static route, o - ODR Gateway of last resort is 10.1.2.3 to network 0.0.0.0 10.0.0.0/24 is subnetted, 1 subnets C 10.1.2.0 is directly connected, Ethernet0/1 S* 0.0.0.0/0 [1/0] via 10.1.2.3 Router# Now notice that the second ip route entry is the Gateway of last resort. Now watch what happens when I reconnect the E0/0 cable. Router# 00:19:27: %LINEPROTO-5-UPDOWN: Line protocol on Interface Ethernet0/0, changed s tate to up Router#sh ip route Codes: C - connected, S - static, I - IGRP, R - RIP, M - mobile, B - BGP D - EIGRP, EX - EIGRP external, O - OSPF, IA - OSPF inter area N1 - OSPF NSSA external type 1, N2 - OSPF NSSA external type 2 E1 - OSPF external type 1, E2 - OSPF external type 2, E - EGP i - IS-IS, L1 - IS-IS level-1, L2 - IS-IS level-2, * - candidate default U - per-user static route, o - ODR Gateway of last resort is 10.1.2.3 to network 0.0.0.0 10.0.0.0/24 is subnetted, 2 subnets C 10.1.2.0 is directly connected, Ethernet0/1 C 10.1.1.0 is directly connected, Ethernet0/0 S* 0.0.0.0/0 [1/0] via 10.1.2.3 [1/0] via 10.1.1.3 Router# The original default gateway is now the backup route. If you want to install the first route as the one to use after the link
RE: IP classless/Default routes
Usually, you can substitute 'public' for 'customer' if the document is publicly available (which this one is) http://www.cisco.com/warp/public/105/default.html Bob -Original Message- From: [EMAIL PROTECTED] [mailto:[EMAIL PROTECTED]]On Behalf Of [EMAIL PROTECTED] Sent: Tuesday, August 08, 2000 11:28 AM To: [EMAIL PROTECTED]; [EMAIL PROTECTED] Subject: RE: IP classless/Default routes Dave, If you have a CCO login check this page out. It explains the differences between Default Gateway, Gateway of last resort, and default network. If you don't have a CCO login, let me know and I will paraphrase the article. Hope this helps. http://www.cisco.com/warp/customer/105/default.html -Original Message- From: Dave Page [mailto:[EMAIL PROTECTED]] Sent: Monday, August 07, 2000 7:05 PM To: 'Cisco List' Subject:IP classless/Default routes In Todd Lammle's book for CCNA 640-407, on p. 202 he has set a default route of BOTH 172.16.40.2 and 172.16.20.1. How does one do this, just enter the IP route command as such, one right after the other (??): ip route 0.0.0.0 0.0.0.0 162.16.40.2 ip route 0.0.0.0 0.0.0.0 162.16.20.1 ??? The reason I ask is that in his book for CCNA 640-507, he states on page 253, "Default routing is used to send packets with a remote destination network not in the routing table to the next hop router. You can only use default routing on stub networks, which means that they have only one exit port out of the network." The two books seem to say contradictory things. Is it because the 507 exam is based on a different IOS? What gives? Dave Page ___ UPDATED Posting Guidelines: http://www.groupstudy.com/list/guide.html FAQ, list archives, and subscription info: http://www.groupstudy.com Report misconduct and Nondisclosure violations to [EMAIL PROTECTED] ___ UPDATED Posting Guidelines: http://www.groupstudy.com/list/guide.html FAQ, list archives, and subscription info: http://www.groupstudy.com Report misconduct and Nondisclosure violations to [EMAIL PROTECTED] ___ UPDATED Posting Guidelines: http://www.groupstudy.com/list/guide.html FAQ, list archives, and subscription info: http://www.groupstudy.com Report misconduct and Nondisclosure violations to [EMAIL PROTECTED]
IP classless/Default routes
In Todd Lammle's book for CCNA 640-407, on p. 202 he has set a default route of BOTH 172.16.40.2 and 172.16.20.1. How does one do this, just enter the IP route command as such, one right after the other (??): ip route 0.0.0.0 0.0.0.0 162.16.40.2 ip route 0.0.0.0 0.0.0.0 162.16.20.1 ??? The reason I ask is that in his book for CCNA 640-507, he states on page 253, "Default routing is used to send packets with a remote destination network not in the routing table to the next hop router. You can only use default routing on stub networks, which means that they have only one exit port out of the network." The two books seem to say contradictory things. Is it because the 507 exam is based on a different IOS? What gives? Dave Page ___ UPDATED Posting Guidelines: http://www.groupstudy.com/list/guide.html FAQ, list archives, and subscription info: http://www.groupstudy.com Report misconduct and Nondisclosure violations to [EMAIL PROTECTED]
RE: IP classless/Default routes
in my experience with having two default routes on a router, they've load-shared across those two interfaces/links. For example, we had a router with a fibre connection and also a wireless connection. The router had two default routes - one across fibre, one across wireless. The fibre went down and half the packets were getting lost, which screamed "load-sharing" to me. I removed the default route across fibre and it worked fine. Cheers, Em -Original Message- From: Dave Page To: 'Cisco List' Sent: 8/8/00 10:05 AM Subject: IP classless/Default routes In Todd Lammle's book for CCNA 640-407, on p. 202 he has set a default route of BOTH 172.16.40.2 and 172.16.20.1. How does one do this, just enter the IP route command as such, one right after the other (??): ip route 0.0.0.0 0.0.0.0 162.16.40.2 ip route 0.0.0.0 0.0.0.0 162.16.20.1 ??? The reason I ask is that in his book for CCNA 640-507, he states on page 253, "Default routing is used to send packets with a remote destination network not in the routing table to the next hop router. You can only use default routing on stub networks, which means that they have only one exit port out of the network." The two books seem to say contradictory things. Is it because the 507 exam is based on a different IOS? What gives? Dave Page ___ UPDATED Posting Guidelines: http://www.groupstudy.com/list/guide.html FAQ, list archives, and subscription info: http://www.groupstudy.com Report misconduct and Nondisclosure violations to [EMAIL PROTECTED] ___ UPDATED Posting Guidelines: http://www.groupstudy.com/list/guide.html FAQ, list archives, and subscription info: http://www.groupstudy.com Report misconduct and Nondisclosure violations to [EMAIL PROTECTED]
Re: IP classless/Default routes
You are correct, equal cost static routes are load balanced on Cisco routers. That's why in a case like that you would want 1 of the statics to have a higher admin weight assigned to it. So the wireless could be ip route 0.0.0.0 0.0.0.0 172.16.2.10 200 and the fiber could be ip route 0.0.0.0 0.0.0.0 192.168.2.10 The static with the lower admin cost will be installed in the route table until the link goes down. Then the other will be installed. Every routing protocol has an admin weight assigned to it. Static and connected routes also have them. Take a look in the docs and you'll find all the defaults. Kenny - Original Message - From: "Emilia Lambros" [EMAIL PROTECTED] To: "'Dave Page '" [EMAIL PROTECTED] Cc: [EMAIL PROTECTED] Sent: Monday, August 07, 2000 7:55 PM Subject: RE: IP classless/Default routes in my experience with having two default routes on a router, they've load-shared across those two interfaces/links. For example, we had a router with a fibre connection and also a wireless connection. The router had two default routes - one across fibre, one across wireless. The fibre went down and half the packets were getting lost, which screamed "load-sharing" to me. I removed the default route across fibre and it worked fine. Cheers, Em -Original Message- From: Dave Page To: 'Cisco List' Sent: 8/8/00 10:05 AM Subject: IP classless/Default routes In Todd Lammle's book for CCNA 640-407, on p. 202 he has set a default route of BOTH 172.16.40.2 and 172.16.20.1. How does one do this, just enter the IP route command as such, one right after the other (??): ip route 0.0.0.0 0.0.0.0 162.16.40.2 ip route 0.0.0.0 0.0.0.0 162.16.20.1 ??? The reason I ask is that in his book for CCNA 640-507, he states on page 253, "Default routing is used to send packets with a remote destination network not in the routing table to the next hop router. You can only use default routing on stub networks, which means that they have only one exit port out of the network." The two books seem to say contradictory things. Is it because the 507 exam is based on a different IOS? What gives? Dave Page ___ UPDATED Posting Guidelines: http://www.groupstudy.com/list/guide.html FAQ, list archives, and subscription info: http://www.groupstudy.com Report misconduct and Nondisclosure violations to [EMAIL PROTECTED] ___ UPDATED Posting Guidelines: http://www.groupstudy.com/list/guide.html FAQ, list archives, and subscription info: http://www.groupstudy.com Report misconduct and Nondisclosure violations to [EMAIL PROTECTED] ___ UPDATED Posting Guidelines: http://www.groupstudy.com/list/guide.html FAQ, list archives, and subscription info: http://www.groupstudy.com Report misconduct and Nondisclosure violations to [EMAIL PROTECTED]
