Hey,
ospfd on 6.0-stable stucks in EXCHG/EXSTA while neighboring with Dell N3048
switch.
According to some documentation around, this is due to MTU mismatch.
This is not in my case.
N3048:
system jumbo mtu 1512
obsd:
trunk1: flags=8943<UP,BROADCAST,RUNNING,PROMISC,SIMPLEX,MULTICAST> mtu 1500
lladdr 00:25:90:78:62:b6
description: HW_INTERNAL
index 12 priority 0 llprio 3
trunk: trunkproto lacp
trunk id: [(8000,00:25:90:78:62:b6,4064,0000,0000),
(0001,f8:b1:56:61:a1:e4,02AE,0000,0000)]
trunkport bnx1 active,collecting,distributing
trunkport em1 active,collecting,distributing
groups: trunk
media: Ethernet autoselect
status: active
inet 10.4.255.27 netmask 0xffffffe0 broadcast 10.4.255.31
ping with diff size of pkts and tcpdump reveals that there is no MTU mismatch.
Restart of ospfd does not helps, only REBOOT.
I decided to dig into this and found that changing MTU size on trunk1 can
reproduce this 100%.
Actually value does not changes, but problem with ospfd can be triggered this
way:
# ifconfig trunk1 mtu 1500
# rcctl restart ospfd
and now ospfd will be stuck in EXCHG/EXSTA. Reboot helps always.
Then I tried to put mtu for each face involved in trunk1. Result is then same -
triggered with ’ifconfig trunk1 mtu 1500’.
# cat /etc/hostname.bnx1
up mtu 1500
# cat /etc/hostname.em1
up mtu 1500
Any ideas?
Br
mxb
