Hi Les,

In last IETF, you presented/stated that Backwards compatibility is not 
possible.  This seems not true. The solution proposed in 
draft-chen-lsr-isis-big-tlv is backwards compatible. Can you give your 
definition of backwards compatibility?

In this IETF and last IETF, the slides states that With partial deployment 
behavior is unpredictable. This seems resolved by draft-chen-lsr-isis-big-tlv.
A container TLV is used by a node to contain a piece of new information. The 
nodes that do not support the capability of container TLV will ignore container 
TLVs. This will resolve unpredictable behavior with partial deployment.

Best Regards,
Huaimo
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