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 i
n
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?
regards,
Peter
Best regards,
Xiaohu
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