Junos OS

My apologies if this has been covered before, but a search did not reveal what I am looking for.

 

Is there a JunOS command that will allow me to search for all bgp neighbors that I am advertising a particular route to?

 

I know that "show route advertising-protocol bgp x.x.x.x" will show me all the routes being advertised to that particular neighbor, but that's not what I'm looking for.

 

Thank you ahead of time!

Hi Andrew,

 

Please clarify if this is just a cosmetic requirement or if there is a particular use-case.  The closest to this I've seen is a BMP feature that monitors the RIB-OUT (supported 19.1 onwards) but not a simple command to check the neighbors where a route is advertised.

 

root@R1# set protocols bgp bmp monitor enable route-monitoring rib-out ?
Possible completions:
<[Enter]> Execute this command
post-policy Send post-policy adj-ribs-out route monitoring messages
pre-policy Send pre-policy adj-ribs-out route monitoring messages
| Pipe through a command

 

Hope this helps.

Regards,
-r.

--------------------------------------------------

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Hi Andrew ,

 

You can use the below shell sctipt as an interim solution 🙂 

i have not tested it extenselvely , it take the route advertised as command line argument and gives the result 

 

#!/bin/sh

prefix="$1"
echo "$prefix"
for i in `cli -c "show bgp summary | match Estab" | awk {'print $1'}`
do
echo "$i"
check=`cli -c "show route advertising-protocol bgp $i | grep $prefix" | awk {'print $2'} `
echo "$check"
if [ $check ]
then
echo "Prefix is advertised to $i"
fi
done

To run go to start shell
vi test.sh , paste the script
sh test.sh <prefix>

Eg from Lab :-
% sh test.sh 60.60.60.0

11.11.11.11
60.60.60.0/30
Prefix is advertised to 11.11.11.11
172.26.226.29
60.60.60.0/30
Prefix is advertised to 172.26.226.29

 

Thx

Anish 

If this solves your problem, please mark this post as "Accepted Solution."
Kudos are always appreciated .

Thank you very much!

 

This is just a case where we were attempting to determine which, if any, bgp neighbors we were advertising a certain route to.

 

I knew I could go look to see the advertised-route to each individual bgp neighbor, but that's very time consuming.

 

I'll give that script a try.  Thanks!

Not any CLI output that I am aware of. No straightforward command I guess. 

 

Probably you should be condifence in the BGP route selection algorithm and Junos implementation. Whatever neighbor it should be advertising to(usually to RR and EBGP peers), unless it's blocked by a policy, it should just advertise. 

Well, as we all know...how things are *supposed* to work, and whether they do or not is a different thing.  And sometimes, we need to be able to "prove" it to the powers that be, so to speak.

 

If everything always worked perfect, we'd all be out of a job.  🙂

 

Thank you folks for the suggestions!  I am going to give that script a try as soon as I am able.

You can use "show route extensive" command see advertise to which BGP group. hope which helps you. 23.0.0.0./21 (1 entry, 1 announced) TSI: KRT in-kernel 23.0.0.0./21 -> {list:172.16.12.38, 172.16.12.42} Page 0 idx 0, (group EBGP_v4 type External) Type 1 val 0x496a3d0 (adv_entry) Advertised metrics: Nexthop: Self AS path: [10] I Communities: 64050:21079 64050:30079