cancel
Showing results for 
Search instead for 
Did you mean: 
cancel
380
Views
0
Helpful
4
Replies

Backup route - from 1 router to 2 switches

just1byte
Level 1
Level 1

Problem: I would like to connect our 3845 MPLS router into two 3560 switches for redundancy.

Current scenario: We currently have ge0/0 from the 3845 connected only to 3560-1. There is a 1Gig link between the 3560-1 and 3560-2. Each of the 3560's then has a separate path back to our main office.

Desired scenario: Utilize both ge0/0 and ge0/1 ports on 3845 with ge0/0 going to 3560-1 switch and 3845 port ge0/1 going to 3560-2 switch to provide better redundancy.

What is the best way to accomplish this. We currently have a static route pointing to ge0/0. Should I simply create another static route pointing to ge0/1 with a higher AD or should I set IP address of ge0/0 and ge0/1 to the same address and configure one as a backup with the backup interface command or is there a much better way?

4 Replies 4

spremkumar
Level 9
Level 9

Hi

I would suggest to take a look on HSRP configs which mite help you to achieve redundancy.

http://www.cisco.com/en/US/products/hw/switches/ps5528/products_configuration_guide_chapter09186a00807741e1.html

regds

Hi Prem,

i am thorough with the HSRP & implemented in my organization 3 yearz b4, i juz happen to see this post today with the link you provided, in that i could see MHSRP & load balancing with the config, that thing is really making me confuse. can u juz explain me that. bcoz in that link, Router-A also got the standby 1 ip & standby 2 ip & same thing for Router-B, but my question is, what IP address will the client hav as a gateway? bcoz this configuration sayz it does load balancing that is why i am confussed.

"figure 38-2" & "configuring MHSRP" which i was referring to.

HSRP is currently configured between the 2 3560 switches but there is currently only one physical cable going from ge0/0 on the 3845 to 3560-1. I would like to connect the second gig port from ge0/1 on the 3845 to the second 3560 (3560-2). What would the commands be to make this happen on the 3845. Currently only ge0/0 has an IP address and is turned up. As previously stated we are currently using a static route on the 3845 to point to the "virtual HSRP router" ip address used between 3560-1 and 3560-2 but there is only one physical connection to 3560-1 and no connection going from the 3845 to 3560-2 so if 3560-1 goes down hard HSRP doesnt really help since there is no additional physical connect from the 3845 to 3560-2. What would be the best way to configure this second port on the 3845?

The best way what i would suggest is follow the diagram.

3650-1 -----> 3650-2(ur existing connection)

3650-1 -----> 3845(ur existing connection)

3650-1 -----> 2960-1(suggested)

3560-2 -----> 2960-1(suggested)

2960-1 -----> 3845(suggested)

Note: Since you say that 3845 has got only 1 physical interface, you need to hav a L2 switch eg. 2960 has to get connected to the main switches 3560-1 & 3560-2, which means even if 3560-1 failz ,3845 will b reached via 3560-2.

hope this helps, rate this post if satisfied.

Getting Started

Find answers to your questions by entering keywords or phrases in the Search bar above. New here? Use these resources to familiarize yourself with the community:

Innovations in Cisco Full Stack Observability - A new webinar from Cisco