weight/metric and BGP default route from provider

Answered Question
Jan 22nd, 2008

I am getting two default routes from my two ISPs via BGP. Since the routes are now equal in weight/metric my outbound traffic is being balanced out both provider circuits. How can I add a weight or metric to one of the two so it becomes the preferred outbound connection?

Thanks,

Diego

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Correct Answer by Danilo Dy about 9 years 2 days ago

Hi,

Both ISP is connected to one router and you only received default route from both not full internet routing table?

Try this...

!

route-map DEFAULT-PREFERRED permit 5

match ip address prefix-list DEFAULT

set weight 150

!

ip prefix-list DEFAULT seq 5 permit 0.0.0.0/0

!

! ...and put the route-map to your preferred ISP for outgoing traffic

!

neighbor a.b.c.d route-map DEFAULT-PREFERRED in

!

To make it work...

Router# clear ip bgp a.b.c.d soft in

Alternatively, you can block all incoming BGP advertisement from your upstream and just put a default route to both with higher AD to non-preferred ISP.

ip route 0.0.0.0 0.0.0.0 a.b.c.d 10 name preferred-isp

ip route 0.0.0.0 0.0.0.0 w.x.y.z. 20 name non-preferred-isp

Regards,

Dandy

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Overall Rating: 4.5 (3 ratings)
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Correct Answer
Danilo Dy Tue, 01/22/2008 - 06:17

Hi,

Both ISP is connected to one router and you only received default route from both not full internet routing table?

Try this...

!

route-map DEFAULT-PREFERRED permit 5

match ip address prefix-list DEFAULT

set weight 150

!

ip prefix-list DEFAULT seq 5 permit 0.0.0.0/0

!

! ...and put the route-map to your preferred ISP for outgoing traffic

!

neighbor a.b.c.d route-map DEFAULT-PREFERRED in

!

To make it work...

Router# clear ip bgp a.b.c.d soft in

Alternatively, you can block all incoming BGP advertisement from your upstream and just put a default route to both with higher AD to non-preferred ISP.

ip route 0.0.0.0 0.0.0.0 a.b.c.d 10 name preferred-isp

ip route 0.0.0.0 0.0.0.0 w.x.y.z. 20 name non-preferred-isp

Regards,

Dandy

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