Tunnel Encap attribute sub-tlv length 48582, exceeds remaining length 28
A couple of my peers started flapping for some reason this morning with the error messages Jan 7 09:48:39 bgpd[19828]: Tunnel Encap attribute sub-tlv length 48582 exceeds remaining length 28 Jan 7 09:48:39 bgpd[19828]: %NOTIFICATION: sent to neighbor xx.yy.zz.205 3/9 (UPDATE Message Error/Optional Attribute Error) 35 bytes e0 ff 20 ac d9 bd c6 ec 73 13 8f f0 6d ed c7 52 11 5a 91 3c 0e 8b 8c 1e be aa f2 72 d5 83 92 83 5e 5b 57 Jan 7 09:48:39 bgpd[19828]: xx.yy.zz.205: Attribute VNC, parse error Jan 7 09:48:39 bgpd[19828]: %ADJCHANGE: neighbor xx.yy.zz.205(Unknown) in vrf Default Down BGP Notification send I was running frr 3.0.3 on FreeBSD RELENG11. Any idea what this bug is or problematic advertisement ? I started a pcap of the bgp sessions, but havent found anything obvious yet -- ------------------- Mike Tancsa, tel +1 519 651 3400 x203 Sentex Communications, mike@sentex.net Providing Internet services since 1994 www.sentex.net Cambridge, Ontario Canada
On Mon, 7 Jan 2019, Mike Tancsa wrote:
I was running frr 3.0.3 on FreeBSD RELENG11. Any idea what this bug is or problematic advertisement ? I started a pcap of the bgp sessions, but havent found anything obvious yet
Another person I talked to said he prefix-list denied 194.39.236.0/22 which made the problem stop happening. -- Mikael Abrahamsson email: swmike@swm.pp.se
Mike - Yes, we have had people asking about this in slack too. We have investigated and found a root cause and are putting patches together now. Effectively if you build FRR w/ vnc enabled (--enable-bgp-vnc=yes) you will be seeing this problem as that VNC also was using attribute type 255 and reading the length as `wrong` and resetting the connection. To solve this for yourself right now: Rebuild FRR w/ `--disable-bgp-vnc` and reinstall. If you are using our build artifacts we are working on new ones now. donald On Mon, Jan 7, 2019 at 10:41 AM Mike Tancsa <mike@sentex.net> wrote:
A couple of my peers started flapping for some reason this morning with the error messages
Jan 7 09:48:39 bgpd[19828]: Tunnel Encap attribute sub-tlv length 48582 exceeds remaining length 28 Jan 7 09:48:39 bgpd[19828]: %NOTIFICATION: sent to neighbor xx.yy.zz.205 3/9 (UPDATE Message Error/Optional Attribute Error) 35 bytes e0 ff 20 ac d9 bd c6 ec 73 13 8f f0 6d ed c7 52 11 5a 91 3c 0e 8b 8c 1e be aa f2 72 d5 83 92 83 5e 5b 57 Jan 7 09:48:39 bgpd[19828]: xx.yy.zz.205: Attribute VNC, parse error Jan 7 09:48:39 bgpd[19828]: %ADJCHANGE: neighbor xx.yy.zz.205(Unknown) in vrf Default Down BGP Notification send
I was running frr 3.0.3 on FreeBSD RELENG11. Any idea what this bug is or problematic advertisement ? I started a pcap of the bgp sessions, but havent found anything obvious yet
-- ------------------- Mike Tancsa, tel +1 519 651 3400 x203 Sentex Communications, mike@sentex.net Providing Internet services since 1994 www.sentex.net Cambridge, Ontario Canada
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participants (3)
-
Donald Sharp -
Mikael Abrahamsson -
Mike Tancsa