We encountered same thing as we deployed 10G links. It was definitely an EIGRP learning experience. We found docs out there that describe changing K values to ignore bandwidth and then manipulate delay in order to achieve optimal routing. When you do this the protocol is supposed to be more OSPF like in the sense that the only value factoring into the equation is a cumulative cost of sorts. This sounded scary to me so we opted for your solution. We set the edge SVI's to maximum bandwidth so they would never be considered in the minimum bandwidth calculation, and then we make sure the SVI's on our L2 trunks are set to the same BW as the underlying link 1G or 10G...
-----Original Message----- From: [email protected] [mailto:[email protected]] On Behalf Of Matthew Huff Sent: Friday, December 11, 2009 10:36 AM To: [email protected] Subject: [c-nsp] EIGRP route knob tuning Anyone know what Cisco's plans for the metrics in EIGRP? 10GE has the bandwidth set at max and the delay set to minimum, so how are they going to handle 40GB and 100GB? Is there any whitepapers posted? I ran into this a while looking at our core routing. The SVI on a 6500 is set to a bandwidth equal to a gig-e interface, so we had some inefficient routing given that we had 10GE layer 3 connections to our distribution. Some routes were heading to the distribution and back rather than across the Layer 2 trunk because the Layer 2 trunk SVI had lower bandwidth. Adjusting the SVI to the max (same as a 10GB interface) fixed the problem. What happens when 100GB uplinks appear? ---- Matthew Huff | One Manhattanville Rd OTA Management LLC | Purchase, NY 10577 http://www.ox.com | Phone: 914-460-4039 aim: matthewbhuff | Fax: 914-460-4139 _______________________________________________ cisco-nsp mailing list [email protected] https://puck.nether.net/mailman/listinfo/cisco-nsp archive at http://puck.nether.net/pipermail/cisco-nsp/
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