nanog mailing list archives
Re: What frame relay switch is causing MCI/Worldcom such grief?
From: Alex Bligh <amb () gxn net>
Date: Tue, 10 Aug 1999 00:09:31 +0200
Yes.
Not disagreeing with Sean, which whilst amusing is often unproductive: One of the higher clue arguments in favour of maintaining an L2 mesh (and 'routing' protocol) is that it converges quicker than than L3 as in theory it has less nodes. The normal counter arguments are: 1. that L1 (SONET/SDH) converges quicker still. 2. as MCI/Worldcom may well have aptly demonstrated, L2 routing protocols have their own problems. 3. L3 routing can be hierarchicalized (sp?) and tweaked to converge just as effectively - witness sending your loopback IP's round as next hops in BGP and running an underlying IGP such as OSPF/ISIS/EIGRP which cuts out many (though unfortunately not all) recomputations when the underlying fabric changes. 4. Implementation of L2 heavy protocols on routers is often poor. Witness how long it took Cisco to implement OAM management. So just how long does it take to notice a VC's gone down? A more convincing argument for buying ATM circuits is that they (are) / (used to be) dirt cheap. Recent experience suggests there may be a reason for this. -- Alex Bligh GX Networks (formerly Xara Networks)
Current thread:
- Re: What frame relay switch is causing MCI/Worldcom such grief? Vadim Antonov (Aug 09)
- Re: What frame relay switch is causing MCI/Worldcom such grief? Prabhu Kavi (Aug 09)
- <Possible follow-ups>
- RE: What frame relay switch is causing MCI/Worldcom such grief? Baird, Alan (Aug 09)
- Re: What frame relay switch is causing MCI/Worldcom such grief? Christopher Gibiault (Aug 09)
- Re: What frame relay switch is causing MCI/Worldcom such grief? Vadim Antonov (Aug 09)
- Re: What frame relay switch is causing MCI/Worldcom such grief? Prabhu Kavi (Aug 09)
- Re: What frame relay switch is causing MCI/Worldcom such grief? Vadim Antonov (Aug 09)
- Re: What frame relay switch is causing MCI/Worldcom such grief? Tony Li (Aug 09)
- Re: What frame relay switch is causing MCI/Worldcom such grief? Vijay Gill (Aug 09)
- Re: What frame relay switch is causing MCI/Worldcom such grief? smd (Aug 09)
- Re: What frame relay switch is causing MCI/Worldcom such grief? Alex Bligh (Aug 09)
- Re: What frame relay switch is causing MCI/Worldcom such grief? smd (Aug 09)
- Re: What frame relay switch is causing MCI/Worldcom such grief? Vijay Gill (Aug 09)
- Re: What frame relay switch is causing MCI/Worldcom such grief? Vadim Antonov (Aug 09)
- Re: What frame relay switch is causing MCI/Worldcom such grief? Vijay Gill (Aug 09)
- the network engineering game Bradley Reynolds (Aug 10)
- Re: What frame relay switch is causing MCI/Worldcom such grief? Vijay Gill (Aug 09)
- Re: What frame relay switch is causing MCI/Worldcom such grief? Vadim Antonov (Aug 10)
- Re: What frame relay switch is causing MCI/Worldcom such grief? Martin Cooper (Aug 10)
- RE: What frame relay switch is causing MCI/Worldcom such grief? Martin Cooper (Aug 11)
- RE: What frame relay switch is causing MCI/Worldcom such grief? Alex P. Rudnev (Aug 11)