Lab report Juniper's latency problems [7:14543]

[Hegde, Raveendra]

Raveendra Hegde






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Re: Lab report Juniper's latency problems [7:14543]

[Howard C. Berkowitz]

Raveendra Hegde

cited the report at http: 
//www.mier.com/reports/cisco/Cisco12400JuniperM160.pdf.

Let's say this report, which was commissioned by Cisco, is the most 
accurate thing in the world.  And your point is?

Routers, especially routers in the class of the GSR and M160, are 
complex systems.  There is no one number that makes one better than 
another in all applications -- there are a series of factors to be 
considered.

Let's put it this way -- I'm actively cooperating in IETF documents
http://www.ietf.org/internet-drafts/draft-ietf-bmwg-conterm-00.txt and
http://www.ietf.org/internet-drafts/draft-ietf-bmwg-bgpbas-00.txt ,
which are coauthored by Nortel, Cisco, Juniper, and Nexthop -- and 
getting feedback from other vendors and users -- just to BEGIN to pin 
down how to measure the convergence behavior of a BGP router. I 
assure you that the result of this effort won't be a single number. 
Nor will forwarding performance (e.g., RFC 2544) produce a single 
number, much less considering QoS enforcement, filtering, etc.

Just throwing out comments about latency as if it is the be-all 
end-all doesn't clarify much.  The Mier and Lightreading reports 
dealt with convergence only with respect to a full table -- what you 
typically see at cold start.  With a router of carrier-class 
reliability, how relatively important is the time to initialize the 
whole table, compared to the performance of the constant adding and 
dropping of routes that goes on constantly?




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