HSRP between two router with different IOS

Unanswered Question
Mar 5th, 2007

Hi,

I have two 7513 router with IOS 12.1(14) GD Enterprise. Fa0/0/2 is crossed while Fa0/0/1 is ISL trunk to two switches.

The trunk port Fa0/0/1 have multiple sub-interfaces configured in HSRP. If I change one of the 7513 with 3845 installed with Advanced Enterprise Service 12.4(?), will the HSRP/ISL trunk still work?

I have this problem too.
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Amit Singh Mon, 03/05/2007 - 03:18

ISL is not available on the internal GigE ports of the 3845 router, but it is available on

Etherswitch module ports. Please check which module you have and proceed accordingly.

HTH,Please rate if it does.

-amit singh

Danilo Dy Mon, 03/05/2007 - 03:45

The router have not arrive yet :)

I also purchase FE module for 3845, I will use the GE to crossed to 7513 FE while the 3845 FE module will be ISL trunk to switch with HSRP in the sub-interfaces. Theoretically they should work.

Danilo Dy Mon, 03/05/2007 - 04:48

The FE module I purchased is NM-2FE2W. I have to change my plan then.

What I'm planning is this to minimize downtime. Replace one of the 7513 with 3845 first then replace the last 7513 with 3845. After that, replace the two switches with 3750 and move the HSRP from 3745 to 3750

Well, as mentioned the devices have not arrived yet. Once I have them, I can try every possible scenario to replace the existing routers and switches.

Your reply is informative at this time, I'll post again on this subject.

This is the config in 7513 interface that I'll be putting in 3845

Router1

!

interface FastEthernet1/0/0.1

description LAN101

encapsulation isl 101

ip address a.b.c.2 255.255.255.0

no ip redirects

no ip unreachables

no ip proxy-arp

ip accounting access-violations

ip multicast boundary 30

no ip mroute-cache

ntp disable

no cdp enable

standby 1 ip a.b.c.1

standby 1 timers 5 15

standby 1 priority 120

standby 1 preempt

standby 1 authentication secret

standby 1 track FastEthernet1/0/0 30

Router2

!

interface FastEthernet1/0/0.1

description LAN101

encapsulation isl 101

ip address a.b.c.3 255.255.255.0

no ip redirects

no ip unreachables

no ip proxy-arp

ip accounting access-violations

ip multicast boundary 30

no ip mroute-cache

ntp disable

no cdp enable

standby 1 ip a.b.c.1

standby 1 timers 5 15

standby 1 priority 100

standby 1 preempt

standby 1 authentication secret

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