If a problem exists with a trunk link, or if a trunk link cannot be
established, check the following:
- Verify that the interface mode configured on both ends of the link is
identical or valid for negotiated links. The interface mode should be trunk,
dynamic, or nonegotiate.
- Verify the trunk encapsulation type configured on both ends of the link is
valid and compatible.
- For 802.1Q links, verify that the native VLAN is the same on both ends of
the trunk.
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NOTE:
If the trunk appears configured correctly on both ends or if the
configuration has changed and no trunk forms, shutdown the interfaces on both
ends of the trunk, check for a match in the configuration, and then bring the
interfaces up to see if the trunk forms correctly.
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