12-06-2012 08:38 AM - edited 03-07-2019 10:26 AM
Hi,
I'm in the process of swapping out a couple routers with a 3750 stack. The previous setup used 2 routers at one location (the ones being replaced) and a third at an offsite location, so between the three they all have a network connection with HSRP. After much searching and reading through the Cisco docs I've found this discussion which appears to be similar HERE . If my understanding is corrrect I believe I have a couple options because I still need the 2 connections to that backup router with HSRP.
1. create a VLAN on the stack with HSRP on it and have a port on each (ie. G1/0/48 and G2/0/48) configured with switchport access to the VLAN.
interface vlan100
ip address 10.10.10.1 255.255.255.0
standby 3 priority 110
interface GigabitEthernet 1/0/48
switchport access vlan 100
interface GigabitEthernet 2/0/48
switchport access vlan 100
OR...
2. create an etherchannel with LACP for the 2 ports and then assign HSRP to the etherchannel
interface port-channel 1
no switchport
ip address 10.10.10.1 255.255.255.0
standby 3 priority 110
interface GigabitEthernet 1/0/1
no switchport
no ip address
channel-protocol lacp
channel-group 1 mode active
interface GigabitEthernet 2/0/1
no switchport
no ip address
channel-protocol lacp
channel-group 1 mode active
Is my understanding correct or is there a better way of accomplishing this?
Your insight is greatly appreciated!
12-06-2012 08:54 AM
Hi,
Since the 3750 stack logically is one switch, you don't have to have 2 connections to the backup router. If you need 2 connections, then portchannel is a better choice, as long as the router also supports portchannel..
HTH
12-06-2012 12:01 PM
Thanks for your reply Reza. Here is a simplified version of my current setup and what is being replaced.
The router pair is using HSRP together for redundancy and I have other ports among the 3 routers with HSRP configured, so the three as a whole can work together. I know the 3750 stack will eliminate the need for HSRP on the pair, but I also need to maintain the HSRP across the 3 routers and I do need the two connections still like the following.
So, are you saying you believe my best bet would be to use port-channel on the 3 ports (one per each device) to create this redundancy with HSRP?
Thanks!
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