Issues with BGP aggregation

[verma-rohit]

Hi,

Please refer to the attached image. I have configured aggregation on switch2 but for some add reason the subnets which is part of the supernet do not show up as suppressed eith locally.

on swicth2 or on swicth4. Shared below is the output from swicth 2 and switch 4.

switch2#show ip bgp summ
switch2#show ip bgp summary 
BGP router identifier 192.168.2.2, local AS number 65000
BGP table version is 6, main routing table version 6
3 network entries using 432 bytes of memory
3 path entries using 252 bytes of memory
2/2 BGP path/bestpath attribute entries using 328 bytes of memory
1 BGP AS-PATH entries using 40 bytes of memory
0 BGP route-map cache entries using 0 bytes of memory
0 BGP filter-list cache entries using 0 bytes of memory
BGP using 1052 total bytes of memory
BGP activity 14/11 prefixes, 19/16 paths, scan interval 60 secs

Neighbor        V           AS MsgRcvd MsgSent   TblVer  InQ OutQ Up/Down  State/PfxRcd
192.168.2.1     4        65001      29      26        6    0    0 00:19:28        2
192.168.3.1     4        65003      19      26        6    0    0 00:13:31        0

switch4#show ip bgp summ
switch4#show ip bgp summary 
BGP router identifier 192.168.3.1, local AS number 65003
BGP table version is 6, main routing table version 6
3 network entries using 432 bytes of memory
3 path entries using 252 bytes of memory
2/2 BGP path/bestpath attribute entries using 328 bytes of memory
2 BGP AS-PATH entries using 64 bytes of memory
0 BGP route-map cache entries using 0 bytes of memory
0 BGP filter-list cache entries using 0 bytes of memory
BGP using 1076 total bytes of memory
BGP activity 4/1 prefixes, 4/1 paths, scan interval 60 secs

Neighbor        V           AS MsgRcvd MsgSent   TblVer  InQ OutQ Up/Down  State/PfxRcd
192.168.3.2     4        65000      27      20        6    0    0 00:14:25        3
switch4#show ip bgp
BGP table version is 6, local router ID is 192.168.3.1
Status codes: s suppressed, d damped, h history, * valid, > best, i - internal, 
              r RIB-failure, S Stale, m multipath, b backup-path, f RT-Filter, 
              x best-external, a additional-path, c RIB-compressed, 
              t secondary path, 
Origin codes: i - IGP, e - EGP, ? - incomplete
RPKI validation codes: V valid, I invalid, N Not found

     Network          Next Hop            Metric LocPrf Weight Path
 *>   10.111.188.0/22  192.168.3.2              0             0 65000 i
 *>   10.111.189.0/24  192.168.3.2                            0 65000 65001 65002 65002 65002 ?
 *>   10.111.190.0/24  192.168.3.2                            0 65000 65001 65002 65002 65002 ?

 BGP Config from all the boxes

switch3
-------
switch3#show run | sec bgp
router bgp 65002
 bgp log-neighbor-changes
 redistribute connected route-map LOOP
 neighbor 192.168.1.2 remote-as 65001
 neighbor 192.168.1.2 route-map ASPATH out

switch1
-------
switch1#show run | sec bgp
router bgp 65001
 bgp log-neighbor-changes
 neighbor 192.168.1.1 remote-as 65002
 neighbor 192.168.2.2 remote-as 65000

switch2
-------
router bgp 65000
 bgp log-neighbor-changes
 aggregate-address 10.111.188.0 255.255.252.0
 neighbor 192.168.2.1 remote-as 65001
 neighbor 192.168.3.1 remote-as 6500

switch 4
--------
switch4#show run | sec bgp
router bgp 65003
 bgp log-neighbor-changes
 neighbor 192.168.3.2 remote-as 65000

[M02@rt37 · Accepted solution]

Hello @verma-rohit,

On SW-2 do:

aggregate-address 10.111.188.0 255.255.252.0
summary-only

This keyword ensures that only the summarized route is advertised without including the more specific routes.

[verma-rohit]

I wish to send summary along with suppressed routes to swicth 4. I have intentionally removed summary-only keyword.