[c-nsp] differential delay

[Mark Rogaski]

An entity claiming to be Jessup, Toby (Toby.Jessup at qwest.com) wrote:
: 
: Bonus question:
: 
: What is the default maximum differential delay value for Cisco MP, MFR,
: IMA? How do you view this or modify it?
: 

The maximum for IMA depends on the size of the IMA frame (M).

 M   Max Diff Delay
---  --------------
 32     1130 msec
 64     2261
128     4422
256     9044

If those seem high, it's because they are ... they are the functional limit
of the protocol.  The 1.0 spec only requires an IMA implementation to
tolerate up to 25 msec of differential delay.

Regardless of the "Troubleshooting Bouncing IMA Links" document on CCO
claims, differential delay is more of an issue for throughput than link
reliability.  Bouncing links are much more likely to be caused by clock
variation than differential delay on an IMA circuit.

To view the differential delay:

  R1# show ima interface atm0/ima0 detail


To change the tolerance:

  R1(config)# interface atm0/ima0
  R1(config-if)# ima differential-delay-maximum 75 


Mark

-- 
[]                     |   Stocks have reached what looks
[] Mark Rogaski        |   like a permanently high plateau.
[] wendigo at pobox.com   |            --Irving Fisher, Professor of Economics,
[] mrogaski at cpan.org   |   	   Yale University, 1929.
[]                     |
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