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mikro2009
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v7: BGP - dump-saved-advertisements

Tue Jun 21, 2022 4:36 pm

Hi all,

according https://help.mikrotik.com/docs/display/ ... h+examples (Monitoring Advertisements) I tried to monitor bgp advertisements. My setup is
(Rx - Mikrotik router, BGPx - ebgp connection name):

R1 --- BGP1 ---- R2 --- BGP2 ---- R3

R1 and R3 are running ROS 6.49.3 and R2 is running ROS 7.3.1. On R2 output..keep-sent-attributes=yes for connection BGP1 is set. If I start/stop BGP2 on R3 all changes are propagated to R1 (to verify that bgp is working). But if I run (on R2)
/routing/bgp/session dump-saved-advertisements BGP1 save-to=bgp1.pcap

nothing happens - /file/print does not list any capture file.

Any ideas?

Best Regards,
Heino
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Re: v7: BGP - dump-saved-advertisements

Tue Jun 21, 2022 4:38 pm

Have you tried this on 7.4beta4 as well?
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mikro2009
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Re: v7: BGP - dump-saved-advertisements

Tue Jun 21, 2022 4:47 pm

Not yet (since it is intended for production purposes to replace ROS 6).

Best Regards,
Heino
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Heino
 
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loloski
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Re: v7: BGP - dump-saved-advertisements

Tue Jun 21, 2022 5:15 pm

same with 7.4beta4
[admin@RT2] > routing/bgp/session/print 
Flags: E - established 
 0 E name="bgp1-1" 
     remote.address=10.10.10.1 .as=1234 .id=192.168.122.181 .refused-cap-opt=no 
     .capabilities=mp,rr,gr,as4 .messages=4 .bytes=76 .eor="" 
     local.address=10.10.10.2 .as=1235 .id=10.10.10.2 
     .capabilities=mp,rr,gr,as4 .messages=5 .bytes=124 .eor="" 
     output.procid=23 .filter-chain=usg-out .network=bgp-networks 
     .keep-sent-attributes=yes 
     input.procid=23 .filter=usg-in ebgp stopped 
     hold-time=3m keepalive-time=1m uptime=3m20s850ms 
[admin@RT2] > /routing/bgp/session/dump-saved-advertisements bgp1-1 save-to=bgp.pcap
[admin@RT2] > /routing/stats/pcap/print 

[admin@RT2] > /system/resource/print 
                   uptime: 25m6s
                  version: 7.4beta4 (testing)
               build-time: Jun/15/2022 11:04:34
         factory-software: 6.49.3
              free-memory: 137.4MiB
             total-memory: 192.0MiB
                      cpu: QEMU
                cpu-count: 1
            cpu-frequency: 2399MHz
                 cpu-load: 3%
           free-hdd-space: 71.8MiB
          total-hdd-space: 89.2MiB
  write-sect-since-reboot: 2216
         write-sect-total: 2216
        architecture-name: x86_64
               board-name: CHR
                 platform: MikroTik
[admin@RT2] > 
 
mikro2009
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Re: v7: BGP - dump-saved-advertisements

Mon Sep 05, 2022 4:51 pm

in ROS 7.5 dump-saved-advertisements (independent whether keep-sent-attributes is on or off) stops the bgp session:
[admin@de-ch-srv-1096] /routing/bgp/connection> print where name=de-ch-srv-1090
Flags: D - dynamic, X - disabled, I - inactive 
 1   ;;; session is stopped
     name="de-ch-srv-1090" 
     remote.address=10.1.4.90 .as=64590 
     local.default-address=10.1.4.96 .role=ebgp 
     tcp-md5-key="hallo" routing-table=main templates=default as=64596 
     output.network=bgp-networks .keep-sent-attributes=no
     
Best Regards,
Heino
 
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Re: v7: BGP - dump-saved-advertisements

Wed Sep 07, 2022 10:02 pm

Confirmed. Attempting to debug routing advertisements via route reflector.
Dump-Saved-advertisements number=1 save-to=temp.pcap

Stops the BGP Session.

Had to do /routing/bgp/session/clear flag=stopped <CR> then choose number of stopped session.

This was a problem because it was supposed to be just debugging (non intrusive) and dropping the session caused an outage. :(
 
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Re: v7: BGP - dump-saved-advertisements

Tue Sep 13, 2022 11:32 pm

I have the same issue. I upgraded to 7.6beta6 and its still present.

Not great...
 
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Re: v7: BGP - dump-saved-advertisements

Wed Sep 14, 2022 10:34 am

same issue
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Re: v7: BGP - dump-saved-advertisements

Wed Sep 14, 2022 1:14 pm

7.4 is the same
If both SSIDs are good quality signal, most modern devices choose 5GHz for the speed.
viewtopic.php?f=7&t=176537


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dmayan
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Re: v7: BGP - dump-saved-advertisements

Sat Sep 24, 2022 5:55 pm

On 7.6b8, dumping stops the session. Also the new option to see BGP advertisements on the cli is nowhere to be found.

Has someone managed to find that option?
 
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Re: v7: BGP - dump-saved-advertisements

Sat Sep 24, 2022 6:10 pm

routing/stats/adverts/show is the base command

publisher - kind of oddly named, but this is the peer you want to see advertised routes from
dsts - filter the output by prefix and length

It appears that prefixes sharing common attributes are grouped together with the attributes at the bottom. It would be nice to get this output in a format like routing/route with headers and have the output aligned in rows/columns. Operationally, it makes more sense to move it to routing/route.

But i'm very glad we have the functionality now.

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Re: v7: BGP - dump-saved-advertisements

Sat Sep 24, 2022 9:59 pm

It appears that prefixes sharing common attributes are grouped together with the attributes at the bottom. It would be nice to get this output in a format like routing/route with headers and have the output aligned in rows/columns.
Since it is a direct output of the data that is sent to the remote peer, then currently data is shown grouped the same way as it is grouped in NLRIs when sent out. It is for performance reasons, to not parse data again.

It is also quite useful not to show duplicate attributes, less useless info, much easier to pick info you need. But that might be a personal preference.

But if sacrificing more resources of the router to put out a routing-like table of the advertisements, then probably we can make it happen.
 
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Re: v7: BGP - dump-saved-advertisements

Sat Sep 24, 2022 10:10 pm

It really depends on what the router is being used for.

In a datacenter with a small internal table of BGP routes that will be advertised, the current format is manageable.

Let's say that i'm debugging an issue for a downstream transit customer that is having problems with routes from google or facebook that my ASN is sending.

Then i might be trying to sort through attributes llike BGP communities that have been advertised with the route (or should be and are not) for a large volume of routes. It's probably worth the CPU hit to get data that's easier to work with.
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Re: v7: BGP - dump-saved-advertisements

Sat Sep 24, 2022 10:14 pm

Currently, also the output is a large string blob, not really easily usable for filtering let's say by prefixes and communities like in your example.
That is why we are asking for as much feedback as possible to know in which direction to move.
 
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Re: v7: BGP - dump-saved-advertisements

Sun Sep 25, 2022 4:23 am

Currently, also the output is a large string blob, not really easily usable for filtering let's say by prefixes and communities like in your example.
That is why we are asking for as much feedback as possible to know in which direction to move.

That makes sense.

Sometimes, you know exactly which prefix you're looking for, but there are times when you want to look at larger blocks of routes in an organized way.

So here is an example of what it would look like to troubleshoot some of Apple's routes from the global table using the current format. It's definitely a bit harder to read when there are lots of routes/attributes.


[admin@bgp-border-ipv4-01] > routing/stats/adverts/show publisher="ipv4-ccr2004-01-1" dsts=17.0.0.0/9
    17.64.0.0/16
    17.65.0.0/16
    17.66.0.0/16
    17.72.0.0/16
    17.79.0.0/16
    17.78.192.0/20
    17.78.224.0/20
    17.78.224.0/19
     origin 0
     as-path seq 65101 65001 13030 1273 714
     nexthop 203.0.113.1
     atomic-aggregate
     communities 256:58930 768:58930 11804:58930 20675:58930 62921:58930
    17.77.128.0/17
    17.77.0.0/16
    17.72.64.0/18
    17.72.96.0/19
     origin 0
     as-path seq 65101 65001 13030 1273 714
     nexthop 203.0.113.1
     atomic-aggregate
     communities 256:58930 768:58930 11804:58930 20675:58930 62921:58930
     aggregator 64714:17.78.235.1
    17.73.0.0/16
    17.74.0.0/15
     origin 0
     as-path seq 65101 65001 13030 1273 714
     nexthop 203.0.113.1
     atomic-aggregate
     communities 256:58930 768:58930 11804:58930 20675:58930 62921:58930
     aggregator 65356:17.78.200.14
    17.70.0.0/15
     origin 0
     as-path seq 65101 65001 13030 1273 714
     nexthop 203.0.113.1
     atomic-aggregate
     communities 256:58930 768:58930 11804:58930 20675:58930 62921:58930
     aggregator 65357:17.78.232.15
    17.78.32.0/21
     origin 0
     as-path seq 65101 65001 13030 1273 714 4445 4445
     nexthop 203.0.113.1
     atomic-aggregate
     communities 256:58930 768:58930 11804:58930 20675:58930 62921:58930
    17.78.64.0/18
    17.78.152.0/21
    17.78.172.0/24
    17.78.179.0/24
    17.78.187.0/24
    17.78.180.0/22
     origin 0
     as-path seq 65101 65001 13030 1299 286 9116 714
     nexthop 203.0.113.1
     atomic-aggregate
     communities 512:58930 4124:58930 4869:58930 43105:4869 49354:58930
    17.80.0.0/16
    17.82.0.0/16
    17.84.0.0/16
    17.84.128.0/23
     origin 0
     as-path seq 65101 65001 13030 1299 6453 714
     nexthop 203.0.113.1
     atomic-aggregate
     communities 512:58930 4124:58930 4869:58930 43105:4869 49354:58930
    17.91.16.0/21
    17.91.24.0/21
    17.91.64.0/21
    17.91.96.0/21
    17.91.208.0/21
    17.84.196.0/23
    17.83.55.0/24
    17.84.198.0/24
     origin 0
     as-path seq 65101 65001 13030 2516 714
     nexthop 203.0.113.1
     atomic-aggregate
     communities 256:58930 4124:58930 49354:58930 62723:58930
    17.84.192.0/22
     origin 0
     as-path seq 65101 65001 13030 2516 714
     nexthop 203.0.113.1
     atomic-aggregate
     communities 256:58930 4124:58930 49354:58930 62723:58930
     aggregator 64914:17.84.195.1
    17.0.128.0/18
     origin 0
     as-path seq 65101 65001 13030 2516 714
     nexthop 203.0.113.1
     atomic-aggregate
     communities 256:58930 4124:58930 49354:58930 62723:58930
     aggregator 65535:17.0.178.1
    17.1.128.0/18
     origin 0
     as-path seq 65101 65001 13030 2516 714
     nexthop 203.0.113.1
     atomic-aggregate
     communities 256:58930 4124:58930 49354:58930 62723:58930
     aggregator 65535:17.0.182.1
    17.46.0.0/16
    17.50.0.0/16
    17.100.0.0/16
    17.102.0.0/15
    17.104.0.0/15
    17.106.0.0/15
    17.108.0.0/15
    17.16.0.0/12
    17.16.64.0/21
    17.24.64.0/21
     origin 0
     as-path seq 65101 65001 13030 2828 714
     nexthop 203.0.113.1
     atomic-aggregate
     communities 512:58930 3083:58930 12060:58930 49098:58930
    17.0.224.0/24
     origin 0
     as-path seq 65101 65001 13030 2828 714
     nexthop 203.0.113.1
     atomic-aggregate
     communities 512:58930 3083:58930 12060:58930 49098:58930
     aggregator 65070:17.0.224.1
    17.1.200.0/24
     origin 0
     as-path seq 65101 65001 13030 2828 714
     nexthop 203.0.113.1
     atomic-aggregate
     communities 512:58930 3083:58930 12060:58930 49098:58930
     aggregator 65339:17.1.200.2
    17.43.0.0/17
    17.44.0.0/17
    17.45.0.0/17
    17.43.0.0/16
    17.44.0.0/16
    17.45.0.0/16
     origin 0
     as-path seq 65101 65001 13030 2828 714
     nexthop 203.0.113.1
     atomic-aggregate
     communities 512:58930 3083:58930 12060:58930 49098:58930
     aggregator 65367:17.0.224.208
    17.34.0.0/16
    17.96.0.0/16
    17.97.0.0/16
    17.98.0.0/16
    17.99.0.0/16
    17.38.0.0/15
    17.40.0.0/15
    17.110.0.0/15
    17.0.240.0/20
    17.35.240.0/20
     origin 0
     as-path seq 65101 65001 13030 714
     nexthop 203.0.113.1
     atomic-aggregate
     communities 256:58930 48586:58930 64771:58930 65307:58930
    17.124.0.0/16
    17.125.0.0/16
     origin 0
     as-path seq 65101 65001 13030 714
     nexthop 203.0.113.1
     atomic-aggregate
     communities 256:58930 48586:58930 64771:58930 65307:58930
     aggregator 65270:17.111.64.1
    17.90.24.0/21
    17.90.32.0/21
    17.90.40.0/21
    17.90.48.0/21
    17.90.96.0/21
    17.90.128.0/21
    17.90.136.0/21
    17.90.144.0/21
    17.90.176.0/21
    17.90.200.0/21
    17.90.208.0/21
    17.86.98.0/23
     origin 0
     as-path seq 65101 65001 13030 7473 7474 714
     nexthop 203.0.113.1
     atomic-aggregate
     communities 256:58930 11292:58930 48842:58930 65027:58930
    17.86.0.0/16
     origin 0
     as-path seq 65101 65001 13030 7473 7474 714
     nexthop 203.0.113.1
     atomic-aggregate
     communities 256:58930 11292:58930 48842:58930 65027:58930
     aggregator 64963:17.86.3.128
    17.50.24.0/21
     origin 0
     as-path seq 65101 65001 14361 174 714
     nexthop 203.0.113.1
     atomic-aggregate
    17.78.173.0/24
    17.78.176.0/24
     origin 0
     as-path seq 65101 65001 14361 6939 8551 714
     nexthop 203.0.113.1
     atomic-aggregate
    17.90.72.0/21
    17.90.112.0/21
    17.90.160.0/21
    17.90.192.0/21
     origin 0
     as-path seq 65101 65001 14361 7473 7474 714
     nexthop 203.0.113.1
     atomic-aggregate
    17.78.178.0/24
     origin 0
     as-path seq 65101 65001 19151 6939 8551 714
     nexthop 203.0.113.1
     atomic-aggregate
     communities 4350:53066 19438:53066 59395:53066
    17.47.0.0/20
     origin 0
     as-path seq 65101 65001 24482 43531 714
     nexthop 203.0.113.1
     atomic-aggregate
     communities 256:41567 9255:2986 46076:41567 59950:41567 60206:41567
     aggregator 65254:17.47.0.193
    17.91.72.0/21
     origin 0
     as-path seq 65101 65001 24482 4635 4637 714
     nexthop 203.0.113.1
     atomic-aggregate
     communities 512:41567 3115:41567 3371:41567 20478:41567
    17.114.0.0/15
     origin 0
     as-path seq 65101 65001 24482 6453 2828 714
     nexthop 203.0.113.1
     atomic-aggregate
     communities 256:41567 13395:41567 19460:13593 22016:13593 22276:13593 23036:41567 56370:41567 56626:41567 59395:13593
    17.90.16.0/21
    17.90.64.0/21
    17.90.104.0/21
    17.90.120.0/21
    17.90.168.0/21
     origin 0
     as-path seq 65101 65001 24482 6453 4637 714
     nexthop 203.0.113.1
     atomic-aggregate
     communities 256:41567 13395:41567 19460:13593 22016:13593 23036:41567 23044:13593 56370:41567 56626:41567 59395:13593
    17.78.144.0/21
    17.78.160.0/21
    17.78.139.0/24
    17.78.177.0/24
     origin 0
     as-path seq 65101 65001 24482 6939 8551 714
     nexthop 203.0.113.1
     atomic-aggregate
     communities 512:41567 56370:41567 56626:41567
    17.91.32.0/21
    17.91.56.0/21
    17.91.200.0/21
     origin 0
     as-path seq 65101 65001 24482 714
     nexthop 203.0.113.1
     atomic-aggregate
     communities 512:41567 555:41567 1323:41567 19966:41567
    17.0.0.0/9
    17.21.96.0/21
    17.22.0.0/21
    17.50.16.0/21
     origin 0
     as-path seq 65101 65001 24482 714
     nexthop 203.0.113.1
     atomic-aggregate
     communities 512:41567 5887:41567 56370:41567 56626:41567
    17.45.192.0/21
     origin 0
     as-path seq 65101 65001 24482 714
     nexthop 203.0.113.1
     atomic-aggregate
     communities 512:41567 5887:41567 56370:41567 56626:41567
     aggregator 64715:17.45.193.225
    17.47.1.0/24
     origin 0
     as-path seq 65101 65001 24482 714
     nexthop 203.0.113.1
     atomic-aggregate
     communities 512:41567 5887:41567 56370:41567 56626:41567
     aggregator 65255:17.47.1.193
    17.121.128.0/17
    17.110.112.0/20
     origin 0
     as-path seq 65101 65001 24482 714
     nexthop 203.0.113.1
     atomic-aggregate
     communities 512:41567 5887:41567 56370:41567 56626:41567
     aggregator 65270:17.111.64.1
    17.69.232.0/22
    17.69.240.0/21
    17.69.192.0/20
    17.67.198.0/23
    17.69.236.0/22
     origin 0
     as-path seq 65101 65001 24482 8220 714
     nexthop 203.0.113.1
     atomic-aggregate
     communities 512:41567 31743:7200 45566:41567 59950:41567 60206:41567 62205:7200
    17.67.192.0/22
    17.67.200.0/22
     origin 0
     as-path seq 65101 65001 24482 8220 714
     nexthop 203.0.113.1
     atomic-aggregate
     communities 512:41567 4350:7200 31743:7200 45566:41567 59950:41567 60206:41567
    17.78.159.0/24
     origin 0
     as-path seq 65101 65001 2497 6939 8551 714
     nexthop 203.0.113.1
     atomic-aggregate
    17.92.128.0/17
    17.91.104.0/21
     origin 0
     as-path seq 65101 65001 9002 6453 714
     nexthop 203.0.113.1
     atomic-aggregate
    17.0.225.0/24
     origin 0
     as-path seq 65101 65001 9002 714
     nexthop 203.0.113.1
     atomic-aggregate
    17.16.208.0/21
     origin 0
     as-path seq 65101 65001 9002 714
     nexthop 203.0.113.1
     atomic-aggregate
     aggregator 65001:10.16.1.165
    17.44.128.0/17
    17.45.128.0/17
     origin 0
     as-path seq 65101 65001 9002 714
     nexthop 203.0.113.1
     atomic-aggregate
     aggregator 65368:17.0.225.208
    17.67.128.0/18
    17.67.252.0/22
    17.67.224.0/20
     origin 0
     as-path seq 65101 65001 9002 8220 714
     nexthop 203.0.113.1
     atomic-aggregate
    17.68.0.0/16
     origin 0
     as-path seq 65101 65001 9002 8220 714
     nexthop 203.0.113.1
     atomic-aggregate
     aggregator 65357:17.78.232.14
    17.127.64.0/20
     origin 0
     as-path seq 65101 65001 9304 174 3356 714
     nexthop 203.0.113.1
     atomic-aggregate
    17.112.0.0/15
     origin 0
     as-path seq 65101 65001 9304 174 714
     nexthop 203.0.113.1
     atomic-aggregate
    17.90.56.0/21
    17.90.80.0/21
    17.90.88.0/21
    17.90.152.0/21
    17.91.80.0/21
    17.91.88.0/21
    17.84.143.0/24
     origin 0
     as-path seq 65101 65001 9304 4637 714
     nexthop 203.0.113.1
     atomic-aggregate
    17.78.140.0/22
    17.78.168.0/22
     origin 0
     as-path seq 65101 65001 9304 6939 8551 714
     nexthop 203.0.113.1
     atomic-aggregate
    17.85.128.0/17
    17.87.0.0/17
    17.87.128.0/17
    17.88.0.0/17
    17.88.128.0/17
    17.42.0.0/16
    17.121.0.0/18
    17.91.40.0/21
    17.91.48.0/21
     origin 0
     as-path seq 65101 65001 9304 714
     nexthop 203.0.113.1
     atomic-aggregate
    17.93.0.0/16
    17.94.0.0/16
     origin 0
     as-path seq 65101 65001 9304 714
     nexthop 203.0.113.1
     atomic-aggregate
     aggregator 64714:17.85.250.14
    17.0.64.0/18
    17.1.64.0/18
     origin 0
     as-path seq 65101 65001 9304 714
     nexthop 203.0.113.1
     atomic-aggregate
     aggregator 65535:17.0.129.2
    17.67.0.0/16
    17.69.0.0/16
    17.67.204.0/22
    17.67.244.0/22
    17.78.208.0/21
    17.67.196.0/23
     origin 0
     as-path seq 65101 65001 9304 8220 714
     nexthop 203.0.113.1
     atomic-aggregate
    17.77.0.0/17
    17.72.64.0/19
     origin 0
     as-path seq 65101 65001 9304 8220 714
     nexthop 203.0.113.1
     atomic-aggregate
     aggregator 64714:17.78.203.2
    17.67.208.0/22
     origin 2
     as-path seq 65101 65001 13030 1273 714
     nexthop 203.0.113.1
     atomic-aggregate
     communities 256:58930 768:58930 11804:58930 20675:58930 62921:58930
    17.83.0.0/17
    17.83.128.0/17
    17.92.0.0/17
    17.87.0.0/16
    17.88.0.0/16
     origin 2
     as-path seq 65101 65001 13030 2516 714
     nexthop 203.0.113.1
     atomic-aggregate
     communities 256:58930 4124:58930 49354:58930 62723:58930
    17.119.92.0/22
     origin 2
     as-path seq 65101 65001 13030 2828 209 18703 2140
     nexthop 203.0.113.1
     atomic-aggregate
     communities 512:58930 3083:58930 12060:58930 49098:58930
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nichky
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Re: v7: BGP - dump-saved-advertisements

Sun Sep 25, 2022 7:15 am

@IPANetEngineer
is that on v7.5?
If both SSIDs are good quality signal, most modern devices choose 5GHz for the speed.
viewtopic.php?f=7&t=176537


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Re: v7: BGP - dump-saved-advertisements

Sun Sep 25, 2022 4:40 pm

@IPANetEngineer
is that on v7.5?

It's on 7.6 beta8 that was just released
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clambert
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Re: v7: BGP - dump-saved-advertisements

Sun Sep 25, 2022 5:24 pm

Will the possibility of seeing the vpnv4 routes advertised to a specific peer be available at some point in the future?
 
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armandfumal
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Re: v7: BGP - dump-saved-advertisements

Mon Sep 26, 2022 3:19 pm

Will the possibility of seeing the vpnv4 routes advertised to a specific peer be available at some point in the future?
already possible in the 7.6b8...
Armand FUMAL
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clambert
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Re: v7: BGP - dump-saved-advertisements

Mon Sep 26, 2022 11:27 pm

Will the possibility of seeing the vpnv4 routes advertised to a specific peer be available at some point in the future?
already possible in the 7.6b8...
What is the command? Because I cannot see the prefixes advertised to the VPNv4 route reflector through the new command /router/stats/adverts.
 
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clambert
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Re: v7: BGP - dump-saved-advertisements

Mon Oct 03, 2022 1:48 pm

You are right @ardmandfumal, it is finally possible to observe the prefixes advertised in VPNv4. It's great.

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