[rbridge] about the future work 1: Trill over IP

[Donald Eastlake]

Hi Xiaohu,

Use of IP as a direct link protocol between RBridge ports has nothing
to do with any possible change in the TRILL Header. You have brought
up all these points about the TRILL Header before quite recently. See
the thread with subject "A question about the Rbridge ID" in
http://www.postel.org/pipermail/rbridge/2010-August/date.html and
http://www.postel.org/pipermail/rbridge/2010-September/date.html

Please top bringing up the same subject when it has already been disposed of.

Thanks,
Donald

2010/11/8 xuxiaohu 41208 <xuxh at huawei.com>:
>
> ----- Ô­Óʼþ -----
> ·¢¼þÈË: Erik Nordmark <erik.nordmark at oracle.com>
> ÈÕÆÚ: ÐÇÆÚÒ», ʮһÔ 8ÈÕ, 2010 ÏÂÎç5:46
> Ö÷Ìâ: Re: »Ø¸´:Re: [rbridge] Question about the future work 1: Trill over IP
> ÊÕ¼þÈË: xuxiaohu 41208 <xuxh at huawei.com>
> ³­ËÍ: rbridge at postel.org
>
>> On 11/ 8/10 01:32 AM, xuxiaohu 41208 wrote:
>> >
>> >
>> > ----- Ô­Óʼþ -----
>> > ·¢¼þÈË: Erik Nordmark<erik.nordmark at oracle.com>
>> > ÈÕÆÚ: ÐÇÆÚÒ», ʮһÔ 8ÈÕ, 2010 ÏÂÎç3:53
>> > Ö÷Ìâ: Re: [rbridge] Question about the future work 1: Trill over IP
>> > ÊÕ¼þÈË: xuxiaohu 41208<xuxh at huawei.com>
>> > ³­ËÍ: rbridge at postel.org
>> >
>> >> On 11/ 7/10 10:54 PM, xuxiaohu 41208 wrote:
>> >>> Hi all,
>> >>>
>> >>> My question about this future work is why not go step further to
>> >>> encapsulate Ethernet over IP directly, rather than encapsulate
>> >>> Ethernet over Trill and then encapsulate Trill over IP?
>> >>
>> >> Can you explain where you would carry the ingress nickname, egress
>> >> nickname, the multi-destination bit, etc in that case?
>> >
>> > Can't we use the source IP address and destination IP address to
>> fill the role of the ingress nickname and egress nickname? Is there
>> any neccessary and vital features that the trill header
>> encapsulation can support while the IP header encapsulation can not?
>>
>> TRILL is based on the nicknames being assigned randomly and then
>> checkedfor duplicates using IS-IS. That doesn't match how IP
>> addresses are
>> normally assigned.
>>
>> Even if you somehow modify how the IP addresses would be assigned to
>> match TRILL's expectations, you'd still need a way to carry other
>> information that is in the TRILL header. For example, the
>> multi-destination bit is a key part which affects how RBridges forward
>> frames.
>
> Can't the class D IP addresses and the PIM protocol fill the multicast function that trill does?
>
> Anything else which is important to trill?
>
> Best regards,
> Xiaohu
>
>>
>>   Erik
>>
>>
>
>
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