bird/BGP: Error: Malformed AS_PATH: 5002001a02020000322b000033b50301

Ondrej Zajicek santiago at
Tue Jun 16 14:28:36 CEST 2009

On Tue, Jun 16, 2009 at 11:57:34AM +0200, Dr. Christian Riede wrote:
> Hello,
> in the search for an alternative to quagga that hopefully has different
> bugs ;-), i am currently evaluating bird.
> Setup:
> +--gw01--+ OpenSuSE/Quagga with uplink (not drawn here)
> |        |
> +--gw02--+ OpenSuSE/Quagga with uplink (not drawn here)
> |        |
> +--gw03--+ OpenBSD/openbgpd without Uplink
> |        |
> +--gw04--+ OpenSuSE/bird without Uplink


> un 16 11:41:26 cn-ka-gw04 bird: bgp5: Error: Malformed AS_PATH: 5002001a02020000322b000033b50301
> Jun 16 11:41:45 cn-ka-gw04 bird: bgp2: Error: Malformed AS_PATH: 5002001a02020000322b000033b50301


Recevied AS_PATH is buggy, as it contains AS_CONFED_SET section, which
is allowed only inside one AS (I suppose it is not generated in your
AS). Requested (but perhaps not wise) behavior is to drop BGP session in
that case, but it seems that it does not happen here. Can you send me
bird.conf and version of Quagga? I will look at it. Do you now what
implementation of BGP used as uplink to Quagga?

If you would be willing to setup multihop BGP session between your
testing Quagga BGP server and my testing BIRD, i could debug it

Elen sila lumenn' omentielvo

Ondrej 'SanTiago' Zajicek (email: santiago at
OpenPGP encrypted e-mails preferred (KeyID 0x11DEADC3,
"To err is human -- to blame it on a computer is even more so."
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