nanog mailing list archives
Re: IGPs in use
From: Henk Smit <hsmit () cisco com>
Date: Wed, 14 Oct 1998 09:08:39 -0700 (PDT)
By contrast, IGPs are *not* fundamentally rate-limited -- retransmissions are not congestion avoiding in any IGP that I know of. So, routing information heading into a congested link or router adds to congestion, which can lead to congestion collapse (and possibly consequent re-routing, moving the problem to another point).
Depends on what you mean by "fundamentally rate-limited". IS-IS is rate-limited to 30 LSPs per second per interface. As per ISO-10589. In IOS you can do some more configuration tricks. Recent IOS has improvements for rate-limiting in OSPF. Thank you Derek. EIGRP has probably the best rate-limiting of them all. EIGRP will never send more EIGRP traffic than a certain (configurable) percentage of the link bandwidth.
Finally, as a side-note, TCP also gives BGP the proper data-stream ordering and dramatically improves the odds that the receiving process will get exactly what was sent by the transmitting process across the network.
This can also be seen as a bug.
Many IGPs have really bad behaviours in the presence of lost frames/packets,
This depends. Are we talking hellos here, or LSAs/LSPs ? IMHO when a Linkstate protocol is deployed in a dense link network, a few lost LSAs/LSPs don't matter much. Henk.
Current thread:
- Re: IGPs in use, (continued)
- Re: IGPs in use I Am Not An Isp (Oct 13)
- Re: IGPs in use Paul G. Donner (Oct 13)
- Re: IGPs in use Danny McPherson (Oct 13)
- Re: IGPs in use Forrest W. Christian (Oct 14)
- Re: IGPs in use Sean M. Doran (Oct 14)
- Re: IGPs in use bmanning (Oct 14)
- Re: IGPs in use Jerry Scharf (Oct 14)
- Re: IGPs in use Tony Li (Oct 14)
- Re: IGPs in use Tony Li (Oct 14)
- Re: IGPs in use Sean M. Doran (Oct 14)
- Re: IGPs in use Henk Smit (Oct 14)
- Re: IGPs in use Tony Li (Oct 14)
- Re: IGPs in use Sean M. Doran (Oct 14)
- Re: IGPs in use Vince Fuller (Oct 14)
- Re: IGPs in use Tony Li (Oct 14)
- Re: IGPs in use alex (Oct 15)
- Re: IGPs in use Paul Ferguson (Oct 16)