[FROG] ibgp regression on 8.5.2 ?

[mike tancsa]

Hi,

     Thanks for the explanation.  Is there any way to work around this 
via configuration ? e.g. temporarily ignore the setting as Transitive ? 
This makes for upgrading very intrusive as I have to upgrade all the 
ibgp routers at once which is very service effecting.

     ---Mike

On 6/30/2023 3:20 AM, Donatas Abraitis wrote:
> Hello, Mike!
>
> With the 8.5.0 release, the new BGP attribute AIGP (Accumulated IGP 
> Metric Attribute) was introduced. This new attribute was mistakenly 
> set as Transitive. This was fixed (53afb27 
> <https://github.com/FRRouting/frr/commit/53afb27eb892a107c9426a01dbba82bee6fa86a7>) 
> with the 8.5.2 release, but it's not backward-compatible between 8.5.x 
> versions. We suggest using only the latest version of the 8.5 release.
>
> If you see such errors/notifications, upgrade to the latest 8.5.x 
> versions, and avoid using 8.5.0, and 8.5.1.
>
> |AIGP attribute must be flagged as "Transitive" |
> |%NOTIFICATION: received from neighbor X.Y.Z.W 3/4 (UPDATE Message 
> Error/Attribute Flags Error) 14 bytes 80 1a 0b 01 00 0b 00 00 00 00 00 
> 00 00 01 |
>
> (This affects only iBGP sessions).
>
>
> On Fri, Jun 30, 2023 at 12:09 AM mike tancsa <mike at sentex.net> wrote:
>
>     Hi, I am guessing it is this commit ?
>
>     commit 231e4de73f46b9c75a07bf0144aafce18aeb3a55
>     Author: Donatas Abraitis <donatas at opensourcerouting.org>
>     Date:   Mon May 8 22:49:10 2023 +0300
>
>          bgpd: Make sure AIGP attribute is non-transitive
>
>          The AIGP attribute is an optional, non-transitive BGP path
>     attribute.
>
>          Signed-off-by: Donatas Abraitis <donatas at opensourcerouting.org>
>
>
>     Is there a way to work around this in configs ?
>
>          ---Mike
>
>     On 6/29/2023 2:39 PM, mike tancsa wrote:
>     > I was updating an internal distribution router that got wedged in
>     > vtysh from 8.5 to 8.5.2 and found all my ibgp peers would not
>     come up.
>     > Same error on the half dozen peers
>     >
>     > Jun 29 14:00:55 ibgp-4 bgpd[38150]: [HZN6M-XRM1G] %NOTIFICATION:
>     > received from neighbor xx.yy.zz.251 3/4 (UPDATE Message
>     > Error/Attribute Flags Error) 14 bytes 80 1a 0b 01 00 0b 00 00 00
>     00 00
>     > 00 00 01
>     > Jun 29 14:01:00 ibgp-4 bgpd[38150]: [HZN6M-XRM1G] %NOTIFICATION:
>     > received from neighbor xx.yy.zz.251 3/4 (UPDATE Message
>     > Error/Attribute Flags Error) 14 bytes 80 1a 0b 01 00 0b 00 00 00
>     00 00
>     > 00 00 01
>     > Jun 29 14:01:05 ibgp-4 bgpd[38150]: [HZN6M-XRM1G] %NOTIFICATION:
>     sent
>     > to neighbor xx.yy.zz.251 3/4 (UPDATE Message Error/Attribute Flags
>     > Error) 14 bytes c0 1a 0b 01 0
>     >
>     > On the older versions of frr,
>     >
>     > [NYD0B-A3BTB][EC 33554433] AIGP attribute must be flagged as
>     "Transitive"
>     > [HZN6M-XRM1G] %NOTIFICATION: sent to neighbor xx.yy.zz.241 3/4
>     (UPDATE
>     > Message Error/Attribute Flags Error) 14 bytes 80 1a 0b 01 0
>     > [GW152-RVASS][EC 33554455] bgp_process_packet: BGP UPDATE receipt
>     > failed for peer: xx.yy.zz.241
>     >
>     > I downgraded from 8.5.2 to 8.5.1 and all was good. Also, another
>     peer
>     > thats still running 7.x was fine with it all.
>     >
>     >
>     > Nothing special about the config. One of the untouched boxes
>     running 8.5
>     >
>     >  neighbor THOTLAN peer-group
>     >  neighbor THOTLAN remote-as 11647
>     >  neighbor THOTLAN description Core1LanEx
>     >  neighbor THOTLAN update-source [dot.251]
>     >  neighbor .241 peer-group HOTLAN
>     >  neighbor .241 description The box the flipped out
>     >  neighbor .241 bfd
>     >   neighbor THOTLAN activate
>     >   neighbor THOTLAN next-hop-self
>     >   neighbor THOTLAN weight 111
>     >
>     > The box I tried to upgrade from 8.5 to 8.5.2 that then went back
>     to 8.5.1
>     >
>     >  neighbor THOTLAN peer-group
>     >  neighbor THOTLAN remote-as 11647
>     >  neighbor THOTLAN update-source [dot.241]
>     >  neighbor THOTLAN timers 16 50
>     >  neighbor .251 description One of the many other peers that
>     didnt like me
>     >  neighbor .251 bfd
>     >   neighbor THOTLAN activate
>     >   neighbor THOTLAN next-hop-self
>     >   neighbor THOTLAN soft-reconfiguration inbound
>     >   neighbor THOTLAN weight 109
>     >
>     >
>     >     ---Mike
>     >
>     >
>
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