08-23-2018 10:31 AM
Hi Everyone,
We have BGP nei with one of ISP and we are not advertising our network to them.
show ip bgp neighbors 206.x.x.253 received-routes
% Inbound soft reconfiguration not enabled on 206.x.x253
I checked route refresh is configured by default.
If i advertise our network to them and run the above command again then I should see received routes from the ISP right?
Regards
Mahesh
08-23-2018 10:56 AM
Hello,
not sure what you are asking. Seeing the routes with the command you mentioned is not related to sending your own network(s) to the ISP. You need soft reconfiguration configured in order to use that command.
sh ip bgp neighbors x.x.x.x routes
does work with the soft reconfiguration inbound configured.
08-23-2018 12:00 PM
What I wanna achieve is advertise our network to ISP and then learn the routes from the ISP.
To make this work do i need to config soft reconfig for that ISP network?
08-23-2018 11:23 AM
08-23-2018 05:17 PM - edited 08-23-2018 05:21 PM
Hello
Enabling soft reconfiguration can have a detrimental effect your rrtr cpu/memory processing if it’s advertising/receiving lots of prefixes .
Nowadays you should not have to enable any soft reconfiguration as bgp supports route refresh which is a lot more efficient to update the adj ribs via a soft reset of each neighbor -
As such this RR capability does not need to store any additional bgp table to accommodate each of its bgp neighbours unprocessed prefixes .
if you do -
sh ip bgp neighbor | in Cap
This will tell you if your router and it’s bgp neighbor supports RR
Lastly to view advertised and receivied prefixes:
sh ip bgp neighbours xxxx routes
sh is bgp neighbours xxxxx advertised routes
To do a no disruptive RR soft reset of a neighbor use-
clear ip bgp neighbor xxx soft in/out
Or
clear ip bgp * soft - for all peers in/out
08-23-2018 08:37 PM - edited 08-23-2018 08:39 PM
I agree with those above. If you want to see who you are peering with run sh ip bgp sum. This will tell you how many prefixes your are receiving from a given peer. Run sh ip bgp nei x.x.x.x adv to see which routes you are advertising and sh ip bgp nei x.x.x.x route to see which routes you are receiving.
08-23-2018 09:52 PM
thanks for very usefull info
to check if RR is configured on nei router i run this command
show ip bgp neighbor 206.x.x.253 | inc Cap
Four-octets ASN Capability: advertised and received
Graceful Restart Capability: received
Enhanced Refresh Capability: advertised
Multisession Capability:
how can i tell from this if local and nei router are configured with RR?
Best Regards
Mahesh
08-27-2018 03:47 PM
thanks for very usefull info
to check if RR is configured on nei router i run this command
show ip bgp neighbor 206.x.x.253 | inc Cap
Four-octets ASN Capability: advertised and received
Graceful Restart Capability: received
Enhanced Refresh Capability: advertised
Multisession Capability:
how can i tell from this if local and nei router are configured with RR?
Best Regards
Mahesh
08-28-2018 06:41 AM - edited 08-28-2018 03:03 PM
Hello
it looks like this neighbor is capable of outbound rr updates
Just to confirm post the following:
show ip bgp neighbor 206.x.x.253 | be Neighbor cap
or
show ip bgp neighbor 206.x.x.253 | be Route
08-28-2018 07:11 AM
I run that command it shows no output.
08-27-2018 03:57 PM
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