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Maniphest T7098

Interface parameters are not synchronized correctly in VPP
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Description

VPP MTU misconfiguration

set vpp interfaces gre gre0 remote '192.0.2.2'
set vpp interfaces gre gre0 source-address '192.0.2.1'
set vpp settings interface eth1 driver 'dpdk'
set vpp settings unix poll-sleep-usec '12'

Expected (needs to figure out), get
GRE = 9000
eth1 = 1500
tap1, which is LCP to eth1 = 9000

vpp# show int
              Name               Idx    State  MTU (L3/IP4/IP6/MPLS)     Counter          Count     
eth1                              1      up          1500/0/0/0     rx packets                     2
                                                                    rx bytes                     104
                                                                    tx packets                    10
                                                                    tx bytes                    1056
                                                                    drops                          2
gre0                              3      up          9000/0/0/0     
local0                            0     down          0/0/0/0       
tap1                              2      up          9000/0/0/0     rx packets                     9
                                                                    rx bytes                     926
                                                                    ip6                            9
vpp#

Details

Version
VyOS 1.5-current-vpp-202501271855
Is it a breaking change?
Perfectly compatible
Issue type
Bug (incorrect behavior)

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Event Timeline

Viacheslav created this task.Jan 27 2025, 9:51 PM
Viacheslav triaged this task as Normal priority.
natali-rs1985 changed the task status from Open to In progress.Dec 22 2025, 11:25 AM
natali-rs1985 claimed this task.
natali-rs1985 changed Is it a breaking change? from Unspecified (possibly destroys the router) to Perfectly compatible.
pasik subscribed.Dec 22 2025, 11:36 AM
natali-rs1985 added a comment.Dec 30 2025, 10:56 AM

https://github.com/vyos/vyos-1x/pull/4920

natali-rs1985 mentioned this in rVYOSONEXa46d27d93a13: T7098: Fix VPP MTU misconfiguration.Jan 8 2026, 3:22 PM
Restricted Repository Identity mentioned this in rVYOSONEXfc945ea7ba90: Merge pull request #4920 from natali-rs1985/T7098.Jan 8 2026, 3:22 PM
natali-rs1985 closed this task as Resolved.Jan 26 2026, 2:21 PM
natali-rs1985 moved this task from Need Triage to Completed on the VyOS Rolling board.
dmbaturin renamed this task from VPP MTU misconfiguration to Interface parameters are not synchronized correctly in VPP.Feb 12 2026, 6:28 PM
dmbaturin added a project: VyOS 1.5 Circinus (2026.02).