Do your 3550s run EMI or SMI? If they run EMI, why not run dynamic routing protocol between the 3550s and the 6500s? OSPF would be a good one to use, if you have hierarchical IP addressing. If your addressing is not hierarchical, then use EIGRP.
Prior to GLBP, you could also have used HSRP. But it's a bloody nuisance to configure, 'cuz you need to configure two different HSRP groups for the same pair of switches, then manually assigning different hosts/PCs to use different default gateways. As I said, bloody nuisance.
If we move both links to either of the switches, we can configure an etherchannel and thus providing aggregated bandwidth along with load-balancing and resiliency. We just need to ensure similar configuration on both ends.
What is the IOS image running on your 6509? It doesn't make sense that 6509s running IOS does not support EIGRP. We have a couple of dozens of these running EIGRP without any problems. In fact, within the corporate environment, 6509 is positioned as the flagship product, which usually means support of anything that Cisco wants to do. Even MPLS (although MPLS support on 6500's is apparently not as extensive as its sister/brother, the 7600s).
Question We run asr9001 with XR 6.1.3, and we have a very long delay to
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Introduction The purpose of this document is to demonstrate the Open
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