Routing

Hi,

currently my internet router have 3 bgp peering with upstream and now establish newupstream.

previously im testing using newupstream looking glass , test latency of specific IP destinatin and prefix and the result is much better compare to my existing upstreams.

now after establish the peering with newupstream, the route/ip i test before still using my old upstreams, i did not set any priority of the upstream everything is equal and based on the best route it can go out.

May i know, is it take some time for the routes to learn and go out via newupstream? or i need to force specific prefix to go out via newupstream? my intention is not to force as i want all the route find the best upstream to go out.

please assist me. thanks.

Hi,

You will likely need to apply an import policy to prefer your new upstream if the prefixes learnt are not active. 

If you can provide an example of a route that is preferred via the old upstream we might be able to provide advice on how to preference those specific routes instead of everything.

Tim

Hi sir,

this is example of active and receive route from my upstreams. NewUpstream active prefixes is only 60K. FYI..this newupstream just activated yesterday

NEWUPSTREAM
Active prefixes: 60858
Received prefixes: 549370

OLDUPSTREAM
Active prefixes: 274502
Received prefixes: 543956

Active prefixes: 213065
Received prefixes: 545783

Chances the new upstream routes are active due to shorter as_path. The other routes will either have a longer as_path or something further down the bgp path selection is choosing the old upstream... maybe router id?

Tim

Hi,

The active prefixes of my peering is not as much as received. The new peering only around 60K active prefixes and the rest is around 200K out of 500K received prefixes. Is this normal? Thanks

for example here

peer1(new)

Table inet.0 Bit: 30011
RIB State: BGP restart is complete
Send state: in sync
Active prefixes: 66487
Received prefixes: 549386
Suppressed due to damping: 0
Advertised prefixes: 30

peer2(existing)

Table inet.0 Bit: 30018
RIB State: BGP restart is complete
Send state: in sync
Active prefixes: 210684
Received prefixes: 545773
Suppressed due to damping: 0
Advertised prefixes: 30

peer3(existing)

Table inet.0 Bit: 30012
RIB State: BGP restart is complete
Send state: in sync
Active prefixes: 270902
Received prefixes: 543892
Suppressed due to damping: 0
Advertised prefixes: 30

Hi,

Yes it looks fine. It means that your new peer is the best path for 60,000 prefixes. The other 480,000 are split between the other 2 links. 

Tim

Thank you sir.