From: ISolveSystems (support@isolvesystems.com)
Date: Wed Jan 21 2009 - 19:30:15 ARST
I am reading the campus network design guide.
http://www.cisco.com/en/US/docs/solutions/Enterprise/Campus/HA_campus_DG/hacampusdg.html
See the paragraph below. Why does the address space selected for the
distribution-to-distribution link must be within the address space being
summarized to be effective?
"Because the distribution nodes send summarized information towards the
core, an individual distribution node does not advertise loss of
connectivity to a single VLAN or subnet. This means that the core does not
know that it cannot send traffic to the distribution member where the link
has failed. Adding an L3 link between the distribution switches allows the
distribution node that loses connectivity to a given VLAN or subnet to
reroute traffic across the distribution-to-distribution link. The address
space selected for the distribution-to-distribution link must be within the
address space being summarized to be effective."
Blogs and organic groups at http://www.ccie.net
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