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Cisco 2851 Routers

B

bwwalk

Junior Member
Looking for some help in getting a couple Cisco 2851 Routers connected up to my ISP in an HSRP configuration for my home lab. The routers have two 1gb interfaces. One interface would need to go to ISP and one interface I need connected to Dell S4810. I have two Dell S4810 switches configured in a VLT and they are working fine
 
I'd like to point out that HSRP will be used by your internal devices to "see" only one gateway. However, from the ISP point of view, there are two gateways.
I'm going to assume Router1 and Router2. On each router, we have G0/1 and Gi0/2 (configured with IP addresses).
I'm going to put both Gi0/1 of both routers in a HRSP group. Here is a minimalist HSRP configuration

Router 1
--
int gi0/1
standby 10 ip // 10 is the HSRP group ID
standby ip 192.168.10.10 // this is the ip address of the HSRP group
standby priority 110 preempt //if for whatever reason Router 2 became Active, then as soon as Router 1 gets back online, it will resumes its role as Active.

Router 2
---
standby 10 ip
standby ip
standby ip 192.168.10.10

Then, for the ISP side, choose gi0/2 of either router to connect to the WAN.
Remember to have both routers connected on a same vlan. Otherwise, if the active HRSP gateway is different from the router with the WAN link, your traffic will not be delivered.
 
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