bgpd: Do not keep stale paths in Adj-RIB-Out if not addpath aware #18275
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```
munet> r1 shi vtysh -c 'show ip bgp update advertised-routes'
update group 1, subgroup 1
BGP table version is 5, local router ID is 192.168.137.1
Status codes: s suppressed, d damped, h history, u unsorted, * valid, > best, = multipath,
i internal, r RIB-failure, S Stale, R Removed
Origin codes: i - IGP, e - EGP, ? - incomplete
Network Next Hop Metric LocPrf Weight Path
*> 1.0.0.0/24 192.168.137.201 10 0 65200 65444 i
*> 10.0.0.0/24 192.168.137.100 10 0 65100 65444 65444 i
*> 10.65.10.0/24 192.168.137.100 0 10 0 65100 i
*> 10.200.2.0/24 192.168.137.202 0 10 0 65200 i
```
Announce one more 10.0.0.0/24 via 65200 and we have TWO paths 10.0.0.0/24 in adj-rib-out:
```
munet> r1 shi vtysh -c 'show ip bgp update advertised-routes'
update group 1, subgroup 1
BGP table version is 6, local router ID is 192.168.137.1
Status codes: s suppressed, d damped, h history, u unsorted, * valid, > best, = multipath,
i internal, r RIB-failure, S Stale, R Removed
Origin codes: i - IGP, e - EGP, ? - incomplete
Network Next Hop Metric LocPrf Weight Path
*> 1.0.0.0/24 192.168.137.201 10 0 65200 65444 i
*> 10.0.0.0/24 192.168.137.100 10 0 65100 65444 65444 i
*> 10.0.0.0/24 192.168.137.201 10 0 65200 65444 i
*> 10.65.10.0/24 192.168.137.100 0 10 0 65100 i
*> 10.200.2.0/24 192.168.137.202 0 10 0 65200 i
```
Stop announcing 10.0.0.0/24 via 65200 and we still have TWO paths for 10.0.0.0/24...
```
munet> r1 shi vtysh -c 'show ip bgp update advertised-routes'
update group 1, subgroup 1
BGP table version is 7, local router ID is 192.168.137.1
Status codes: s suppressed, d damped, h history, u unsorted, * valid, > best, = multipath,
i internal, r RIB-failure, S Stale, R Removed
Origin codes: i - IGP, e - EGP, ? - incomplete
Network Next Hop Metric LocPrf Weight Path
*> 1.0.0.0/24 192.168.137.201 10 0 65200 65444 i
*> 10.0.0.0/24 192.168.137.100 10 0 65100 65444 65444 i
*> 10.0.0.0/24 192.168.137.201 10 0 65200 65444 i
*> 10.65.10.0/24 192.168.137.100 0 10 0 65100 i
*> 10.200.2.0/24 192.168.137.202 0 10 0 65200 i
```
Why do we need to keep old paths in adj-rib-out if we don't have e.g. AddPaths enabled?
Shouldn't it be like here? (only one 10.0.0.0/24 in adj-rib-out for this update-group instead of multiple (stale from previous announcements))
```
munet> r1 shi vtysh -c 'show ip bgp update advertised-routes'
update group 1, subgroup 1
BGP table version is 6, local router ID is 192.168.137.1
Status codes: s suppressed, d damped, h history, u unsorted, * valid, > best, = multipath,
i internal, r RIB-failure, S Stale, R Removed
Origin codes: i - IGP, e - EGP, ? - incomplete
Network Next Hop Metric LocPrf Weight Path
*> 1.0.0.0/24 192.168.137.201 10 0 65200 65444 i
*> 10.0.0.0/24 192.168.137.201 10 0 65200 65444 i
*> 10.65.10.0/24 192.168.137.100 0 10 0 65100 i
*> 10.200.2.0/24 192.168.137.202 0 10 0 65200 i
```
Signed-off-by: Donatas Abraitis <donatas@opensourcerouting.org>
There was a case where removing the selected (single best) route leads to adj-rib-out to be vanished at all. Signed-off-by: Donatas Abraitis <donatas@opensourcerouting.org>
ton31337
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riw777
approved these changes
Mar 4, 2025
|
do you have a topotest for that ? |
… RS setup Signed-off-by: Donatas Abraitis <donatas@opensourcerouting.org>
|
Added a topotest. |
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Announce one more 10.0.0.0/24 via 65200 and we have TWO paths 10.0.0.0/24 in adj-rib-out:
Stop announcing 10.0.0.0/24 via 65200 and we still have TWO paths for 10.0.0.0/24...
Why do we need to keep old paths in adj-rib-out if we don't have e.g. AddPaths enabled?
Shouldn't it be like here? (only one 10.0.0.0/24 in adj-rib-out for this update-group instead of multiple (stale from previous announcements))
Closes #18222