[j-nsp] bgp-nexthop-sanity errors?

[Hyunseog Ryu]

Hi there,

Recently I was looking at Juniper router logs, and I found following 
messages.


Jan 14 02:34:38  router-hostname rpd[3268]: bgp_nexthop_sanity: peer 
X.X.X.X (External AS 64514) next hop Y.Y.Y.Y local, ignoring routes in 
this update

X.X.X.X is the loopback address of remote router, which is peering ip 
address, and Y.Y.Y.Y is local router's interface ip address.
Our router's BGP session use remote loopback address as peering ip 
address, and I set local-address to loopback address from all of routers.
We are using BGP confederation, and also configured for ebgp-multihop, 
too.
But for some reason, when router receives BGP prefixes from remote router, 
local router think it was came from local router's interface, not from 
remote router.
When our routers exchanges the router inside our BGP confederation 
network, it doesn't change next-hop to self.

I opened the case with JTAC, and I could not get satisfactory answers.
They said it was fixed since 7.4R1.7, but we ar e running 7.6R1.10.

Any info or advice will be helpful. 

Thanks.

Hyun


Hyunseog Ryu
Senior Network Engineer
Norlight Telecommunications, Inc./Applications Engineering
13935 Bishops Drive
Brookfield, WI 53005 
Phone. +1-262-792-7965
Fax. +1-262-792-7733
Email. hryu at norlight.com