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Community Member

Using Two ISP links on remote sites..

Hello,

I have a ISP links on my remote site's router on Gig 0/1 and now I am planning for a secondary link.Since, I have only two gig ports ( one is used by ISP link and other is used as LAN gateway),the other ISP is ready to provide secondary link on serial port.

I am using BGP as protocol and MPLS as a media. Kindly let me know what changes \ extra configurations I'll have to do for  running my remote sites on either primary or secondary links ?

Thanks & Regards,

Anil Kumar

3 REPLIES
Cisco Employee

Using Two ISP links on remote sites..

Hi Anil,

You have some options to prefer one BGP route over the other. You need to consider the route preference on both direction, ingress and egress. I think the easiest way is to add as-path prepend on both direction of the secondard link.

HTH,

Lei Tian

Community Member

Using Two ISP links on remote sites..

Hi Lei,

I  have the below configuration done in my remote router. Can you please send me sample config on the same ?


interface Loopback1
ip address 10.26.129.abc 255.255.255.255
!
!
interface GigabitEthernet0/0
description CONNECTED TO LAN F0/1
ip address 10.26.129.acb 255.255.255.224
duplex auto
speed auto
media-type rj45
!
!
interface GigabitEthernet0/1                     //Currently used by primary ISP//
bandwidth 2048
ip address 10.26.129.pqr 255.255.255.252
duplex auto
speed auto
media-type rj45
no cdp enable
!
!
interface Serial0/0/0               // To Be used by second ISP//
no ip address
shutdown
clock rate 125000
!

router bgp xxxy
no synchronization
bgp log-neighbor-changes
network 10.26.129.acb mask 255.255.255.224  //LAN IP pool
network 10.26.129.abc mask 255.255.255.255   //Loopback IP address.
neighbor 10.cc.129.161 remote-as xxxx    //next hop of gig0/1 towards primary ISP
neighbor 10.cc.129.161 allowas-in 4      ////next hop of gig0/1 towards primary ISP
no auto-summary
!

Regards,

Anil Kumar

Cisco Employee

Using Two ISP links on remote sites..

Hi Anil,

If you are receiving same routes from both providers, the following config should work

router bgp xxxy

neighbor x.x.x.x remote-as xxx //secondary ISP

neighbor x.x.x.x route-map INBOUND in

neighbor x.x.x.x route-map OUTBOUND out

route-map OUTBOUND permit 10

set as-path prepend x x x x //local-as number

!

route-map INBOUND permit 10

set as-path prepend last-as 4

HTH,

Lei Tian

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