Scott Brim wrote:
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?)
Indeed, if you have explicit forwarding instructions, you use that.
Locators are necessarily about network attachments (per stack). If a
host has multiple points of attachment, then it should have multiple
locators. And only one identifier.
Regards,
Tony
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