Re: [Xen-users] Bridges stop forwarding

[Pasi Kärkkäinen <pasik@xxxxxx>]

Hi!

I got this kind of problem with IBM blades.. solution was to upgrade the
onboard NIC (tg3/broadcom) firmware.

Same problem happened with VMware.

-- Pasi 

On Tue, Aug 29, 2006 at 12:31:58PM +0100, Gavin Hamill wrote:
> Hello :) I'm using 3.0.2 on Ubuntu Dapper, set up using the packages
> from http://ubuntu.cs.mtsu.edu/packages/xen/ along with the
> Dom0 kernel and modules from the 3.0.2 32-bit distribution tarball.
> 
> I am trying to model a network using multiple DomUs and bridge
> instances, running Quagga and OSPF amongst them, but I'm experiencing a
> very much more basic connectivity problem.
> 
> Very simply, after a while, a bridge stops forwarding, yet it still
> knows about the MAC address on each port:
> 
> root@scribe:~# brctl showmacs tower-sw
> port no mac addr                is local?       ageing timer
>   2     00:16:3e:63:e2:8c       no                 1.99
>   1     00:16:3e:73:4f:20       no                 0.44
>   2     fe:ff:ff:ff:ff:ff       yes                0.00
> root@scribe:~# brctl  show
> ...
> u10-tower   8000.feffffffffff  no vif14.0
>                                   vif10.2
> ...
> 
> I have 6 bridges in total, including xenbr0, and all have a bridge ID
> of 8000.feffffffffff - is this bad? Hence, the MAC address of each
> bridge is FE:FF:FF:FF:FF:FF (as well as that of each vifX.Y)
> 
> The DomU's at either end of the u10-tower bridge are 10.0.1.1 and
> 10.0.1.254, and when I try to ping each from its counterpart, I see this
> on Dom0:
> 
> root@scribe:~# tcpdump -i tower-sw -n
> tcpdump: WARNING: tower-sw: no IPv4 address assigned
> tcpdump: verbose output suppressed, use -v or -vv for full protocol
> decode listening on tower-sw, link-type EN10MB (Ethernet), capture size
> 96 bytes 
> 11:42:00.850064 arp who-has 10.0.1.1 tell 10.0.1.254
> 11:42:01.312926 arp who-has 10.0.1.254 tell 10.0.1.1
> 11:42:01.849986 arp who-has 10.0.1.1 tell 10.0.1.254
> 11:42:02.312928 arp who-has 10.0.1.254 tell 10.0.1.1
> 11:42:02.850053 arp who-has 10.0.1.1 tell 10.0.1.254
> 11:42:03.312926 arp who-has 10.0.1.254 tell 10.0.1.1
> 
> Even if I assign an IP address to u10-tower on Dom0, I can not ping
> either host...
> 
> Here's the really interesting part.. watch what happens as 10.0.1.254
> shuts down starting with a few 1-second pings from 10.0.1.1... 
> 
> 12:12:02.532932 arp who-has 10.0.1.254 tell 10.0.1.1
> 12:12:03.532925 arp who-has 10.0.1.254 tell 10.0.1.1
> 12:12:04.532930 arp who-has 10.0.1.254 tell 10.0.1.1
> 12:12:05.532932 arp who-has 10.0.1.254 tell 10.0.1.1
> 12:12:06.532932 arp who-has 10.0.1.254 tell 10.0.1.1
> 12:12:07.532936 arp who-has 10.0.1.254 tell 10.0.1.1
> 12:12:07.852683 IP 10.0.1.1 > 10.0.1.254: ICMP echo request, id 12039,
> seq 15, length 64 
> 12:12:07.853398 IP 10.0.1.1 > 10.0.1.254: ICMP echo request, id 12039,
> seq 16, length 64 
> 12:12:07.853814 arp reply 10.0.1.1 is-at 00:16:3e:63:e2:8c
> 12:12:07.854081 arp reply 10.0.1.1 is-at 00:16:3e:63:e2:8c
> 12:12:07.854474 arp reply 10.0.1.1 is-at 00:16:3e:63:e2:8c
> 12:12:07.854707 arp reply 10.0.1.1 is-at 00:16:3e:63:e2:8c
> 12:12:07.855049 arp reply 10.0.1.1 is-at 00:16:3e:63:e2:8c
> (there were dozens of these replies)
> 
> The echo request + subsequent flood of ARP replies happens the instant
> the DomU says "System halted".
> 
> It appears to be a repeatable problem - I just let the system sit for
> ~15 mins and the bridge stops forwarding :(
> 
> Does this sound at all familiar to anyone? :)
> 
> Cheers,
> Gavin.
> 
> 

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