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Trunking a 6500 running Native IOS to 5500 running CATOS

Has anyone out their expierenced problems with spaning-tree while trying to create an ISL trunk to a 5500 from a 6500 running Native IOS??? I have 2 6500 running in HSRP talking via a trunked port-channel. They work and talk fine until I try to trunk the 5500 to one of them. This creates a problem as I have 5 secondary distribution switches that will connect to these cores that are 5500's!!!

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Re: Trunking a 6500 running Native IOS to 5500 running CATOS

Have you tried using 802.1q?

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