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Re: questions on draft-bryant-ipfrr-tunnels-01.txt

Subject: Re: questions on draft-bryant-ipfrr-tunnels-01.txt
From: mike shand
Date: Mon, 22 Nov 2004 18:59:50 +0000
At 12:39 22/11/2004 -0500, Alia Atlas wrote:
What can you get with a single primary repair?

Some examples of the percentage of node repairs which require secondaries below. This is calculated by taking the number of repairs for node repair which require a secondary repair divided by the total number of repairs. Where a repair is a repair to a single neighbor's neighbor.
e.g.
          V
          |
S---------E----U
          |
          T

The repairs for node E failing would be

SV,SU,ST
VS,VT,VU
etc.


0.79%
13.77%
3.98%
1.47%
0.50%
4.64%
0.00%


(Note that the 13% one is a hub and spoke like network which gives only about 70% coverage for U-turns (link repair; I haven't simulated U-turns for node repair). It is quite a nasty topology for any IPFRR mechanism)

        Mike



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