[rbridge] loops in trill networks

[Joe Touch]

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Yes - but I think Radia pointed out that this is no different than how
existing bridges would behave in that circumstance.

joe


Larry Kreeger (kreeger) wrote:
> Joe,
> 
> The context was that during a topology change, there could be a
> temporary loop.  While this temporary loop exists, multicast/broadcasts
> would duplicate to edge ports each time they came around - until the TTL
> reaches its limit.
> 
>  - Larry
> 
> -----Original Message-----
> From: rbridge-bounces at postel.org [mailto:rbridge-bounces at postel.org] On
> Behalf Of Joe Touch
> Sent: Tuesday, October 11, 2005 1:02 PM
> To: Developing a hybrid router/bridge.
> Subject: Re: [rbridge] loops in trill networks
> 
> 
> 
> Larry Kreeger (kreeger) wrote:
> 
>>>OK, I can see how a TTL will stop loops, and would prevent duplicate 
>>>known unicasts from being delivered, but how does a TTL stop 
>>>broadcast/multicast/unknown unicast frames from being duplicated to 
>>>edge ports each time the frame comes round the loop?
> 
> 
> The multicast/broadcast packets are forwarded by one or more spanning
> trees. There should never be loops in those anyway as a result.
> 
> Joe
> 
> 
>>>Or is this considered
>>>OK behavior in an RBridge network compared to an 802.1 bridged
> 
> network?
> 
>>>New to all this...  - Larry
>>>
>>>-----Original Message-----
>>>From: rbridge-bounces at postel.org [mailto:rbridge-bounces at postel.org] 
>>>On Behalf Of Joe Touch
>>>Sent: Tuesday, October 11, 2005 7:07 AM
>>>To: Developing a hybrid router/bridge.
>>>Subject: Re: [rbridge] loops in trill networks
>>>
>>>There is, and that's what it's there for.
>>>
>>>Joe
>>>
>>>Mike Hughes wrote:
>>>
>>>
>>>>--On 11 October 2005 15:23 +0200 Loa Andersson <loa at pi.se> wrote:
>>>>
>>>>
>>>>
>>>>
>>>>>this might be an old discussion, but it is some time since it look at
> 
> 
>>>>>it. What do we do in trill networks about transient loops, i.e. if 
>>>>>use
>>>
>>>
>>>>>link state protocols there is a possibility that we have transient 
>>>>>loops. With no TTL mechanisms those looping frames could cause quite 
>>>>>a
>>>
>>>
>>>>>bit of problem.
>>>>
>>>>
>>>>Unless I've missed something, or things have changed overnight, there 
>>>>is a TTL provided in the SHIM header.
>>>>
>>>>Mike
>>>
>>>_______________________________________________
>>>rbridge mailing list
>>>rbridge at postel.org
>>>http://www.postel.org/mailman/listinfo/rbridge
> 
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