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Maniphest T2845

BGP conf_mode unable to delete configuration with peer-group
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Description

Unable to delete protocol bgp configuration if it uses "peer-group".
To reproduce.

set protocols bgp 65001 neighbor 10.0.0.2 interface peer-group 'foo'
set protocols bgp 65001 neighbor 10.0.0.2 interface remote-as '65002'
set protocols bgp 65001 peer-group foo
commit

[email protected]# delete protocols bgp 
[edit]
[email protected]# commit
[ protocols bgp 65001 ]
% Create the bgp interface first
Error configuring routing subsystem.  See log for more detailed information

[edit]
[email protected]#

Vtysh

!
router bgp 65001
 neighbor foo peer-group
!

Or 'internal' or 'external' param

set protocols bgp 65001 neighbor 10.0.0.2 interface peer-group 'foo'
set protocols bgp 65001 neighbor 10.0.0.2 interface remote-as 'internal'
set protocols bgp 65001 peer-group foo
commit

[email protected]# commit
[ protocols bgp 65001 ]
% Create the bgp interface first
Error configuring routing subsystem.  See log for more detailed information

[edit]
[email protected]#

Vtysh

!
router bgp 65001
 neighbor foo peer-group
!

Details

Difficulty level
Unknown (require assessment)
Version
VyOS 1.3-rolling-202008260118
Why the issue appeared?
Will be filled on close
Is it a breaking change?
Unspecified (possibly destroys the router)
Issue type
Bug (incorrect behavior)

Related Objects
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Event Timeline

Viacheslav created this task.Aug 31 2020, 9:19 AM
Viacheslav added a parent task: T2174: Rewrite protocol BGP to new XML/Python style.
pasik added a subscriber: pasik.Aug 31 2020, 11:40 AM
c-po added a project: VyOS 1.4 Sagitta.Feb 14 2021, 11:12 AM
c-po added a subscriber: c-po.

Issue no longer persists in VyOS 1.4. Tested using: 1.4-rolling-20210214

c-po moved this task from Need Triage to Finished on the VyOS 1.4 Sagitta board.Feb 14 2021, 11:13 AM
Viacheslav added a comment.Apr 29 2021, 10:06 AM

A possible reason it tried to remove " neighbor 10.0.0.2 remote-as 65002" after " neighbor 10.0.0.2 interface peer-group foo"
But if we delete " neighbor 10.0.0.2 interface peer-group foo" it also delete and "" neighbor 10.0.0.2 remote-as 65002"
So it can't delete this string

!
router bgp 65001
 neighbor foo peer-group
 neighbor 10.0.0.2 interface peer-group foo
 neighbor 10.0.0.2 remote-as 65002
!

Delete manual

r4-1.3# conf t
r4-1.3(config)# router bgp 
r4-1.3(config-router)# no  neighbor 10.0.0.2 interface peer-group foo
r4-1.3(config-router)# 
r4-1.3(config-router)# do show run
!
router bgp 65001
 neighbor foo peer-group
!
line vty
!
end
r4-1.3(config-router)#

Trying to delete the second line (which already deleted)

[email protected]# vtysh -c "configure terminal" -c "router bgp 65001" -c "no neighbor 10.0.0.2 interface remote-as internal"
% Create the bgp interface first
[edit]
[email protected]#
erkin set Issue type to Bug (incorrect behavior).Aug 29 2021, 1:15 PM
erkin removed a subscriber: Active contributors.
olofl added a subscriber: olofl.Aug 30 2021, 8:21 PM
Viacheslav mentioned this in T3887: Removal of IPv6 BGP-peer with peer-group may trigger problems.Oct 4 2021, 1:39 PM
syncer merged a task: T3887: Removal of IPv6 BGP-peer with peer-group may trigger problems.Oct 17 2021, 1:23 PM
syncer added subscribers: rcit, NikolayP.
syncer edited projects, added VyOS 1.3 Equuleus (1.3.0); removed VyOS 1.3 Equuleus.Nov 6 2021, 11:24 AM
TMA added a subscriber: TMA.Aug 8 2022, 7:45 AM
syncer edited projects, added VyOS 1.3 Equuleus (1.3.3); removed VyOS 1.3 Equuleus (1.3.0).Aug 29 2022, 7:05 AM