Routing Problem

[ronald.ramzy]

Hello

Seeking help for routing issue,

Primary route for R3 to reach R1 is via SP

Backup route for R3 to reach R1 is via R2

When backup link is up then packet drop is noticed from R3 to R1

R2----------------R3---------(service_provider)-------------R1

R2-----------------------------(service_provider)-------------R1

R3 is connected to R2 on a Point to Point Link

R3 reaches R1 using SP network

R2 reaches R1 using SP network

((( Router R3 )))

int fa 0/0

description Connected to R2

ip add 192.168.1.1 255.255.255.252

ip ospf cost 25

Int fa 0/1

description Connected to R1 (SP )

ip add 172.16.33.26 255.255.255.252

int fa 0/0/0

description connected to LAN - vlan1

no shut

int vlan1

ip add 10.10.1.1 255.255.252.0

router ospf 1

network 192.168.1.0 0.0.0.3

network 10.10.1.0 0.0.3.255

redistribute bgp 8190 subnets

router bgp 8190

redistribute ospf 1
neighbor 172.16.33.26  remote-as 8899

no auto-summary

[Giuseppe Larosa]

Hello Ronald,

compare sh ip route   with the backup link down and with the backup link up

you may be facing a problem when primary link is restored caused by non zero weight of locally injected routes into BGP

you can solve this using:

router bgp 8190

neigh 172.16.33.26 weight 40000

Hope to help

Giuseppe

[ronald.ramzy]

Thank You, it worked.

How can I restrict the Bandwidth to 2MB on fa 0/0 ( Total traffic in/out = 2MB )

[Giuseppe Larosa · Accepted solution]

Hello Ronald,

you can use a shaper for this outbound direction on both routers (if both are under your control)

policy-map shape-2Mbps

class class-default

shape average 2000000

int f0/0

service out shape-2Mbps

done on both ends

depending on platform and needs a child policy could be invoked to implement a queueing system (scheduler)

Hope to help

Giuseppe