Excerpts from William Herrin on Wed, Nov 11, 2009 07:04:54PM -0500:
> Important consequences of this are:
>
> a. Locators aren't about network attachments. They're about the
> packet forwarding process and more abstractly about the network
> topology. An element that always has exactly one attachment to the
> network is likely a holy grail. Case and point, the IP address on my
> BGP router with two upstreams is certainly a locator but it clearly
> has two points of attachment.
I think this conflates two things we distinguished for a while, and
the distinction should not be lost. I don't remember the name for the
second one, but we have
- names for a network attachment points ("locator")
- information used for forwarding at intermediate hops (forwarding
directives? something like that. was it Noel's?)
Locators are not the only thing used by intermediate forwarding, and
in fact might not be used at all by some forwarder if other state info
suffices.
Scott
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