There is not enough information here to really help you, from a static route perspective 2 routes, one with a higher admin distance for the T1 will work quite well. You should probably run a routing protocol in this scenario, so that in the event that the T3 line is taking so many errors that it is unusable, but the line protocol remains up, the fact that you don't have end to end connectivity to maintain a neighbor relationship will remove the invalid route from the table.
-----Original Message----- From: Mike Peterson [mailto:[EMAIL PROTECTED]] Sent: Thursday, October 10, 2002 12:17 PM To: [EMAIL PROTECTED] Subject: Sorry for first posted email ....Need help with this scenarios [7:55293] Dear All, We do have two sites (LIC and 45). one with MSFC2 and 2600 and one with RSM and 2600. .These sites are connected via T-3 and T-1. We would like to use the T-1 as a backup in case T-3 fails .We want just only one segment (10.120.0.0/16 from 45 to go over T-1 to LIC segment which is 120.0.0.0 this is our Back Office services that we need to have protected and insure that it is operational all the times given a sudden failure on the primary link T-3). We want a solution to this problem by using Static Routes and Administrative Distance. Note: Please, be advise that the IP addresses might not be the right one. (Those IPs we came up with are just samples.) Another consideration is that we have to deal with bridging irb too so would you please think at anything that we are missing but solve our problem. We want to see this scenarios from another angle and to consider another way of achieving our goal (we might need to use IP of Loop back Interfaces on both : RSM and MSFC ,or to use IP address of VLAN 20 on one site and VLAN 120 on the other site, also the use of access list too ) by using static route and administrative distance. Also, you might want to use different IP scheme and also keep in mind that in LIC site (vlan 30) the Gateway is 130.0.5.1 and 45 (vlan 120) the GW IP: is 10.120.9.1 and is configured in all the workstations. Any help or input it will be GREAT. Thank you, Mike P. [EMAIL PROTECTED] -------------------- -------------------- 172.16.20.2/24 172.16.20.1/24 RSM MSFC -----------------------T3-------------------------- -------------------- ---------------------- | | 10.120.0.1/16 | | | | 120.0.0.0/16 10.120.0.0/16 | GW:120.0.5.1 | GW: 10.120.9.1 | | | 120.0.0.1/16 | 10.120.0.1/16 ------------------------ ------------------------- LIC 39 -----------------------T1---------------------- 192.168.11.2/24 192.168.11.1/24 -------------------------- --------------------------- Here are our main configs: RSM ( is configured with 10 VLAN interfaces and two vlans does bridging irb which are not Concerned in this case, also use frame relay ) Create another subint : # int serial 1/0.145 Ip address 172.16.20.2/24 Frame-relay int-dlci 145 Router eigrp 5 Network 172.16.20.0 0.0.0.255 #ip route 10.120.0.0 255.255.0.0 120.0.0.1 250 MSFC (is configured with 10 VLAN interfaces and two vlans does bridging irb which are not Concerned in this case, also use frame relay ) Create another subint #int serial 3/0/0.145 Ip address 172.16.20.1/24 Frame-relay int-dlci 145 Router eigrp 5 Network 172.16.20.0 0.0.0.255 #ip route 120.0.0.0 255.255.0.0 10.120.0.1 250 LIC : (DOES ONLY STATIC ROUTE NO DYNAMIC ROUTE) # ip route 10.120.0.0 255.255.0.0 192.168.11.1 45 (Does only static route and no DYNAMIC ROUTE) # ip route 120.0.0.0 255.255.0.0 192.168.11.2 [GroupStudy.com removed an attachment of type application/msword which had a name of TOPOLOGY FOR T1 AS A BACKUP FOR T3.doc] Message Posted at: http://www.groupstudy.com/form/read.php?f=7&i=55309&t=55309 -------------------------------------------------- FAQ, list archives, and subscription info: http://www.groupstudy.com/list/cisco.html Report misconduct and Nondisclosure violations to [EMAIL PROTECTED]
