Xuxiaohu,
On 1/29/14 10:16 , Xuxiaohu wrote:
-----邮件原件-----
发件人: Peter Psenak [mailto:[email protected]]
发送时间: 2014年1月29日 17:11
收件人: Xuxiaohu
抄送: [email protected]; [email protected]
主题: Re: [spring] [OSPF] fwd: New Version Notification for
draft-xu-ospf-global-label-sid-adv-00.txt
Xiaohu,
On 1/29/14 09:53 , Xuxiaohu wrote:
For example, assume a label block {1000, 1999} is allocated for prefix
segments by almost all SR routers and a global label 1005 is allocated to a
given
prefix segment, for a given seldom SR router which couldn't preserve the above
label block and allocates a different label block (e.g., {2000, 2999}) instead,
a
local label corresponding to that global label (or that prefix segment) could be
calculated through offsetting, i.e., the result is 1005+ (2000-1000)=2005. In
this
way, there is no need for introducing the Index concept anymore and therefore
the architecture becomes much easy to understand. More importantly,
compared to the index binding advertisement, the label binding advertised by
the IGP is exactly the same as that in the label forwarding table for those
most SR
routers which have allocated the above common label block, which is much
beneficial when doing troubleshooting. This approach does not violate the
strongest MPLS dogma (i.e., labels MUST be local) while!
taking in
to account the actual situation, IMHO
above would require the "seldom SR router" to know the offset from the SRGB
used by other routers. How do you envision that to be learned?
Hi Peter,
I don't think it's a big problem. The common SRGB could either be manually
configured on the seldom SR router or advertised by the MS.
manual configuration is not an option - just imagine you have multiple
"seldom SR routers", each having a different label block. Now you not
only need an offset for "common" block, but also offset between label
blocks used on these "seldom SR routers".
Once you start to advertise it, you are back to the model we have
already, but you made it even worse with offsets.
regards,
Peter
Best regards,
Xiaohu
regards,
Peter
Best regards,
Xiaohu
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