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Maniphest T5104

DHCP default route issues with static routes in VRFs
Closed, ResolvedPublicBUG
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Description

  1. When a VRF has a DHCP default route, adding a static route to the VRF removes the default route from the VRF.
  2. When the default VRF has a DHCP default route, adding a static route to a VRF duplicates the default route in the VRF.

Setup:

set vrf name MGMT table 100
set interfaces ethernet eth0 vrf MGMT
set interfaces ethernet eth0 address dhcp
commit
sleep 10
vtysh -c 'show running-config'
Building configuration...

Current configuration:
!
frr version 8.4.2
frr defaults traditional
hostname vyos
log syslog
log facility local7
service integrated-vtysh-config
!
vrf MGMT
 ip route 0.0.0.0/0 192.168.128.1 eth0 tag 210 210
exit-vrf
!
rpki
exit
!
end

Note the presence of a default route in the VRF.

Bug #1:

set vrf name MGMT protocols static route 1.1.1.1/32 dhcp-interface eth0
commit
vtysh -c 'show running-config'
Building configuration...

Current configuration:
!
frr version 8.4.2
frr defaults traditional
hostname vyos
log syslog
log facility local7
service integrated-vtysh-config
!
vrf MGMT
 ip route 1.1.1.1/32 192.168.128.1 eth0
exit-vrf
!
rpki
exit
!
end

Note the absence of a default route in the VRF.

Reset (avoiding T5103):

delete interfaces ethernet eth0 address
delete vrf name MGMT protocols
commit
delete interfaces ethernet eth0 vrf
commit
set interfaces ethernet eth0 address dhcp
commit
sleep 10
vtysh -c 'show running-config'
Building configuration...

Current configuration:
!
frr version 8.4.2
frr defaults traditional
hostname vyos
log syslog
log facility local7
service integrated-vtysh-config
!
ip route 0.0.0.0/0 192.168.128.1 eth0 tag 210 210
!
rpki
exit
!
end

Note the presence of a default route in the default VRF.

Bug #2:

set vrf name MGMT protocols static route 1.1.1.1/32 dhcp-interface eth0
commit
vtysh -c 'show running-config'
Building configuration...

Current configuration:
!
frr version 8.4.2
frr defaults traditional
hostname vyos
log syslog
log facility local7
service integrated-vtysh-config
!
ip route 0.0.0.0/0 192.168.128.1 eth0 tag 210 210
!
vrf MGMT
 ip route 0.0.0.0/0 192.168.128.1 eth0 tag 210 210
 ip route 1.1.1.1/32 192.168.128.1 eth0
exit-vrf
!
rpki
exit
!
end

Note the default route is duplicated in the VRF.

Details

Version
1.4-rolling-202303170317
Is it a breaking change?
Perfectly compatible
Issue type
Bug (incorrect behavior)

Related Objects

Event Timeline

stepler created this task.Mar 21 2023, 6:18 PM
stepler changed the task status from Open to In progress.
stepler claimed this task.
stepler added a comment.Mar 21 2023, 6:48 PM

PR https://github.com/vyos/vyos-1x/pull/1903

syncer triaged this task as Normal priority.Mar 21 2023, 6:50 PM
stepler edited a custom field.Mar 21 2023, 6:56 PM
stepler edited a custom field.
stepler changed Is it a breaking change? from Unspecified (possibly destroys the router) to Perfectly compatible.
stepler changed Issue type from Unspecified (please specify) to Bug (incorrect behavior).
pasik subscribed.Mar 21 2023, 7:14 PM
Restricted Repository Identity mentioned this in rVYOSONEXb3629cc33ba8: Merge pull request #1903 from bstepler/T5104.Mar 21 2023, 7:55 PM
stepler mentioned this in rVYOSONEXc376ddedfc1a: dhcp: pppoe: T5104: fix VRF comparisons.Mar 21 2023, 7:55 PM
c-po changed the task status from In progress to Needs testing.Mar 21 2023, 7:55 PM
stepler closed this task as Resolved.Mar 27 2023, 12:22 PM

Looks good on 1.4-rolling-202303271007:

set vrf name MGMT table 100
set interfaces ethernet eth0 vrf MGMT
set interfaces ethernet eth0 address dhcp
commit
sleep 10
vtysh -c 'show running-config'
vtysh_pam: Failed in account validation: Success(0)Building configuration...

Current configuration:
!
frr version 8.5
frr defaults traditional
hostname vyos
log syslog
log facility local7
service integrated-vtysh-config
!
vrf MGMT
 ip route 0.0.0.0/0 192.168.128.1 eth0 tag 210 210
exit-vrf
!
rpki
exit
!
end
set vrf name MGMT protocols static route 1.1.1.1/32 dhcp-interface eth0
commit
vtysh -c 'show running-config'
vtysh_pam: Failed in account validation: Success(0)Building configuration...

Current configuration:
!
frr version 8.5
frr defaults traditional
hostname vyos
log syslog
log facility local7
service integrated-vtysh-config
!
vrf MGMT
 ip route 0.0.0.0/0 192.168.128.1 eth0 tag 210 210
 ip route 1.1.1.1/32 192.168.128.1 eth0
exit-vrf
!
rpki
exit
!
end
delete interfaces ethernet eth0 address
delete vrf name MGMT protocols
commit
delete interfaces ethernet eth0 vrf
commit
set interfaces ethernet eth0 address dhcp
commit
sleep 10
vtysh -c 'show running-config'
vtysh_pam: Failed in account validation: Success(0)Building configuration...

Current configuration:
!
frr version 8.5
frr defaults traditional
hostname vyos
log syslog
log facility local7
service integrated-vtysh-config
!
ip route 0.0.0.0/0 192.168.128.1 eth0 tag 210 210
!
rpki
exit
!
end
set vrf name MGMT protocols static route 1.1.1.1/32 dhcp-interface eth0
commit
vtysh -c 'show running-config'
vtysh_pam: Failed in account validation: Success(0)Building configuration...

Current configuration:
!
frr version 8.5
frr defaults traditional
hostname vyos
log syslog
log facility local7
service integrated-vtysh-config
!
ip route 0.0.0.0/0 192.168.128.1 eth0 tag 210 210
!
vrf MGMT
 ip route 1.1.1.1/32 192.168.128.1 eth0
exit-vrf
!
rpki
exit
!
end
vyos@vyos:~$ show version
Version:          VyOS 1.4-rolling-202303271007
Release train:    current

Built by:         autobuild@vyos.net
Built on:         Mon 27 Mar 2023 10:07 UTC
Build UUID:       71d83095-0dc3-4fa8-a23e-285b938552a0
Build commit ID:  d68bda6a295ba9

Architecture:     x86_64
Boot via:         livecd
System type:       guest

Hardware vendor:  QEMU
Hardware model:   Standard PC (Q35 + ICH9, 2009)
Hardware S/N:     
Hardware UUID:    cc81ba04-0592-527c-8fcb-3d8cc3cbdd5c

Copyright:        VyOS maintainers and contributors