Hi, Tony, Les and Paul:
As I read the draft https://tools.ietf.org/html/draft-ietf-lsr-isis-extended-hierarchy-00, and notice the proposal to expand the reserved bits in "Circuit Type" to cover the level 1-8 in ISIS domain. Here I just want to know is it necessary to expand the IS-IS level to 8 and occupy all the reserved bits in the PDU format? As compared with the OSPF format, there is one field to describe the "Link Type" (5 bits, currently define only four types). We want to use the reserved bits in current "Circuit Type" of ISIS PDU format to fulfill the similar tasks. Can this draft leave at least 2 reserved bits for this purpose? There are many ways to tackle the scale of networks, who will design their network in level 8 hierarchy? As I estimated, Level 4 may be the acceptable highest network hierarchy. Best Regards. Aijun Wang China Telecom
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