Re: OSPF Loopback [7:52478]
a point-to-multipoint network is a different animal. The RFC requires that such networks be advertised as host routes. Check out RFC 2328 for particulars -- www.chuckslongroad.info still a work in progress, but on line for your enjoyment z ""Robert Mac"" wrote in message [EMAIL PROTECTED]">news:[EMAIL PROTECTED]... > thanks a lot Stefan! > > I got the answer the doc says I need to put an "ip ospf network type > point-to-point" cmd on the loopback in order to to reveal their actual > subnet identity. I do not know whether this will work for a > point-to-multipoint network. Let me look for an alternative. > > thanks Message Posted at: http://www.groupstudy.com/form/read.php?f=7&i=52498&t=52478 -- FAQ, list archives, and subscription info: http://www.groupstudy.com/list/cisco.html Report misconduct and Nondisclosure violations to [EMAIL PROTECTED]
RE: OSPF Loopback [7:52478]
thanks a lot Stefan! I got the answer the doc says I need to put an "ip ospf network type point-to-point" cmd on the loopback in order to to reveal their actual subnet identity. I do not know whether this will work for a point-to-multipoint network. Let me look for an alternative. thanks Message Posted at: http://www.groupstudy.com/form/read.php?f=7&i=52496&t=52478 -- FAQ, list archives, and subscription info: http://www.groupstudy.com/list/cisco.html Report misconduct and Nondisclosure violations to [EMAIL PROTECTED]
RE: OSPF Loopback [7:52478]
ip ospf network point-to-point Here's the OSPF:FAQ http://www.cisco.com/warp/public/104/9.html#QB HTH Stefan -Original Message- From: [EMAIL PROTECTED] [mailto:[EMAIL PROTECTED]]On Behalf Of Robert Mac Sent: Sunday, September 01, 2002 9:14 AM To: [EMAIL PROTECTED] Subject: OSPF Loopback [7:52478] Hi, How to show a /24 loopback address as /24 entry itself in the routing table? By default in OSPF it is shown as a /32 even if you advertise as /24. I didn't do any summarization inbetween. Any helpers please... thanks Message Posted at: http://www.groupstudy.com/form/read.php?f=7&i=52481&t=52478 -- FAQ, list archives, and subscription info: http://www.groupstudy.com/list/cisco.html Report misconduct and Nondisclosure violations to [EMAIL PROTECTED]
Re: OSPF Loopback
Hello Christ! If every router adv the loopback subnet though OSPF. Then you can ping to them. A proper static router also can help you to reach the loopback subnet in another router. Cisco router dose not allow you to put two interface in same subnet. When I work out the IP addressing plan. I usually reserve a subnet for loopback address. And all loopback address will draw from this subnet, with a 32 bit subnet mask. In some case. Loopback address may reach by proxy ARP. eg : Router A -- 172.100.1.254, use 24 bit subnet mask. All router's LAN interface use 172.100.1.128/25, default route to 172.100.1.254 All router's loopback use 172.100.1.1 - 172.100.1.254 /32 If you ping from to other loopback address from your router. It will consider as different subnet, and consult Router A. Router A consider the desination address as same subnet. It send out ARP request to locate the loopback you want. If a router have the loopback inside it. This router will response to this ARP request. This is know as Proxy ARP. On Cisco platform, Proxy ARP is enabled by default. Finally you can ping to the loopback address you want. Enjoy!! Quncy Lau CCNP Hong Kong Christopher Larson wrote: > If all the interfaces in say area 0 are 170.100.1.0 /24 and my loopbacks > are 2.2.2.0/24, should I be able to ping each loopback from all the > other routers? or do I need to make my loopbacks a subnet of the > 170.100.1.0/24 address?? > > Thanx!! > > _ > FAQ, list archives, and subscription info: http://www.groupstudy.com/list/cisco.html > Report misconduct and Nondisclosure violations to [EMAIL PROTECTED] _ FAQ, list archives, and subscription info: http://www.groupstudy.com/list/cisco.html Report misconduct and Nondisclosure violations to [EMAIL PROTECTED]
RE: OSPF Loopback
Are the loopback addresses being advertised throughout your OSPF domain? Or to put it another way, how would a remote router know how to route a packet to a network not advertised? HTH Chuck -Original Message- From: [EMAIL PROTECTED] [mailto:[EMAIL PROTECTED]] On Behalf Of Christopher Larson Sent: Tuesday, December 05, 2000 10:51 AM To: '[EMAIL PROTECTED]' Subject:OSPF Loopback If all the interfaces in say area 0 are 170.100.1.0 /24 and my loopbacks are 2.2.2.0/24, should I be able to ping each loopback from all the other routers? or do I need to make my loopbacks a subnet of the 170.100.1.0/24 address?? Thanx!! _ FAQ, list archives, and subscription info: http://www.groupstudy.com/list/cisco.html Report misconduct and Nondisclosure violations to [EMAIL PROTECTED] _ FAQ, list archives, and subscription info: http://www.groupstudy.com/list/cisco.html Report misconduct and Nondisclosure violations to [EMAIL PROTECTED]
RE: OSPF Loopback
Hi Chris, You can have your loopbacks address as 2.2.2.0/24 but we required to put in either static or dynamic routing for all the routers to learn abt this address, otherwise, all other router will not able to ping the loopback address of other's router. Hope this will answer your questions. Rgds, Sam > -Original Message- > From: Christopher Larson [SMTP:[EMAIL PROTECTED]] > Sent: Wednesday, December 06, 2000 2:51 AM > To: '[EMAIL PROTECTED]' > Subject: OSPF Loopback > > If all the interfaces in say area 0 are 170.100.1.0 /24 and my loopbacks > are 2.2.2.0/24, should I be able to ping each loopback from all the > other routers? or do I need to make my loopbacks a subnet of the > 170.100.1.0/24 address?? > > Thanx!! > > _ > FAQ, list archives, and subscription info: > http://www.groupstudy.com/list/cisco.html > Report misconduct and Nondisclosure violations to [EMAIL PROTECTED] _ FAQ, list archives, and subscription info: http://www.groupstudy.com/list/cisco.html Report misconduct and Nondisclosure violations to [EMAIL PROTECTED]
