Hi,
Need some clarification on the preference among IS-IS IPv6 route types
described in RFC7775 section 3.4 and RFC5308 section 5.
RFC7775 places L1 intra-area routes and L1 external routes at the same
preference level and says that all types of routes listed for a given
preference are treated equally. There is no mention of metric.
<snip>
This document defines the following route preferences for IPv6 routes
advertised in TLVs 236 or 237. Note that all types of routes listed
for a given preference are treated equally.
1. L1 intra-area routes; L1 external routes
2. L2 intra-area routes; L2 external routes; L1->L2 inter-area
routes; L1-L2 external routes; L2-L2 inter-area routes
3. L2->L1 inter-area routes; L2->L1 external routes; L1->L1 inter-
area routes
</snip>
RFC5308 however says:
<snip>
If multiple paths have the same best preference, then selection
occurs based on metric.
</snip>
It is not clear whether metric is to be used for selection among L1
intra-area and external routes or is to be used for selection only with a
given route type. Can someone please clarify?
Regards,
Muthu
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