ipv6 nd managed-config-flag ignored?

Thomas Pircher thp.frrouting at p5r.uk
Tue Nov 17 10:47:02 UTC 2020


I'm using frr version 4.0+cl3u17 on a Cumulus router. I'm having
troubles setting the managed-config-flag for RA packets. I have this in
my configuration file for the VLAN interface I'd like to configure with
the managed-config-flag on:

| interface vlan124
|  vrrp 3
|  vrrp 3 ipv6 fd00:4d56:414c:6000::1
|  vrrp 3 priority 150
|  ipv6 nd managed-config-flag

But when I sniff the outgoing packets on the interface, I get "Flags [none]" in tcpdump:

| # tcpdump -lnn -i vlan124 -vvvv -ttt icmp6 and 'ip6[40] = 134'
| tcpdump: listening on vlan124, link-type EN10MB (Ethernet), capture size 262144 bytes
|  00:00:00.000000 IP6 (hlim 255, next-header ICMPv6 (58) payload length: 24) fe80::c981:f4f7:7f26:a79b > ff02::1: [icmp6 sum ok] ICMP6, router advertisement, length 24
|         hop limit 64, Flags [none], pref medium, router lifetime 48s, reachable time 0ms, retrans timer 0ms
|           source link-address option (1), length 8 (1): 00:00:5e:00:02:03
|             0x0000:  0000 5e00 0203

Is there something I'm doing wrong? Any help is appreciated.


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