12-11-2005 02:20 AM - edited 03-03-2019 11:11 AM
I am trying to decide based on calculations which routing protocol has better convergence time: OSPF or ISIS.
Assuming routers are in INIT state and going through all stages until FULL in OSPF or reaching the decision phase in ISIS.
When neutralizing all the non-routing process factors (network size, CPU, memory, link delay, etc) I guess this would have to take into consideration the hello times, the updating process timers, SPF & PRC timers, size and structure of packets in LSDB an so on.
I would appreciate more in depth information on this issue, like: formulas, recent papers published on this issue, other aspect to take into consideration.
I know this is a wide issue, and out of the scope of this group but still, looking for leads.
Thanks in advance, Yaron
12-11-2005 05:28 AM
Hello Yaron,
admittedly, my experience with ISIS is purely related to the (preparation for the) CCIE exam.
But maybe you find these documents useful:
Intermediate System-to-Intermediate System Protocol
http://www.cisco.com/en/US/tech/tk365/technologies_white_paper09186a00800a3e6f.shtml
Cisco NSF and Timer Manipulation for Fast Convergence
http://www.cisco.com/en/US/tech/tk869/tk769/technologies_white_paper09186a00801dce40.shtml
OSPF Design Guide
http://www.cisco.com/en/US/tech/tk365/technologies_white_paper09186a0080094e9e.shtml
HTH,
GP
12-11-2005 10:03 AM
Hi GP,
Thanks for your response, but I am looking into more in depth information, rather than high level documents (though the NSF doc is very interesting).
I would appreciate the forum help on this.
Yaron
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