Open
Description
Same as issue #1601
I use MPD daemon to make VPN links, an don inactive or non existend interfaces ospfd use MTU=1500 bytes.
When links up MTU changes to different value, but ospfd uses 1500 and we get MTU mismatch on other side.
FRR:
FRRouting 7.5 (homeserver-ospfd).
Copyright 1996-2005 Kunihiro Ishiguro, et al.
configured with:
'--enable-user=frr' '--enable-group=frr' '--enable-vty-group=frrvty' '--disable-doc-html' '--sysconfdir=/usr/local/etc/frr' '--localstatedir=/var/run/frr' '--disable-backtrace' '--disable-nhrpd' '--disable-pimd' '--disable-vrrpd' '--with-vtysh-pager=cat' '--disable-config-rollbacks' '--disable-datacenter' '--enable-fpm' '--disable-ldpd' '--without-libpam' '--enable-rpki' '--disable-shell-access' '--disable-snmp' '--disable-tcmalloc' '--enable-vtysh' '--prefix=/usr/local' '--mandir=/usr/local/man' '--disable-silent-rules' '--infodir=/usr/local/share/info/' '--build=amd64-portbld-freebsd12.2' 'build_alias=amd64-portbld-freebsd12.2' 'PKG_CONFIG=pkgconf' 'CC=cc' 'CFLAGS=-O2 -pipe -fstack-protector-strong -fno-strict-aliasing ' 'LDFLAGS= -L/usr/local/lib -L/usr/local/lib -fstack-protector-strong ' 'LIBS=' 'CPPFLAGS=-I/usr/local/include -I/usr/local/include' 'CPP=cpp' 'CXX=c++' 'CXXFLAGS=-O2 -pipe -fstack-protector-strong -fno-strict-aliasing ' 'PYTHON=/usr/local/bin/python3.7'
FreeBSD homeserver 12.2-RELEASE-p4 FreeBSD 12.2-RELEASE-p4 r369447 GENERIC amd64
#ifconfig
ng1: flags=88d1<UP,POINTOPOINT,RUNNING,NOARP,SIMPLEX,MULTICAST> metric 0 mtu 1400
inet 192.168.199.1 --> 192.168.199.5 netmask 0xffffffff
inet6 fe80::2e0:f4ff:fe1e:2839%ng1 prefixlen 64 scopeid 0xa
nd6 options=21<PERFORMNUD,AUTO_LINKLOCAL>
#sh ip ospf interface
ng1 is up
ifindex 10, MTU 1500 bytes, BW 0 Mbit <UP,POINTOPOINT,RUNNING,NOARP,SIMPLEX,MULTICAST>
This interface is UNNUMBERED, Area 0.0.0.0
MTU mismatch detection: enabled
Router ID 172.31.1.1, Network Type POINTOPOINT, Cost: 10
Transmit Delay is 1 sec, State Point-To-Point, Priority 1
No backup designated router on this network
Multicast group memberships: OSPFAllRouters
Timer intervals configured, Hello 10s, Dead 40s, Wait 40s, Retransmit 5
Hello due in 1.394s
Neighbor Count is 1, Adjacent neighbor count is 0