BGP dual homing same ISP

[sebastien3]

Hi,

I have 2 sites running eBGP on the same ASN peering with same ISP but at different locations. I use communities to prefer a prefix on each router.

R1 and R2 are connected together with iBGP and exchange full-view. R1 and R2 are the same local-preference.

I get a metric from the BGP neighbors of the ISP...I would like to be able to remove this metric so that it is 0.

What do you recommend ? set metric 0 in

route-map

in with match ASN of ISP ?

Thanks !

[sebastien3]

M02@rt37 

No it's not mandatory. Just as a precaution if the

route-map

is used later when adding another ISP...

[M02@rt37]

OK @sebastien3!

[paul driver]

Hello
You can negate the med calculation by using a different BGP attribute.

Example 1
for egress traffic = Give RTR1 a higher Local-preference than RTR2
for ingress traffic = Advertise a longer as-path sequence from RTR2 towards its ebgp peering's 

Or
for ingress traffic = If applicable to do - Advertise a summary route for your local networks from both RTR1 & RTR2 towards their ebgp peers and then advertise more specific routes( no longer then /24) from the rtr you wish return traffic for that prefix should take ------(this is more elegant solution I think)