[c-nsp] Cisco RSTP interop with 802.1w equipment

[Marian Ďurkovič]

Hi all,

  I wonder if there's any solution to the following interoperability issue:

Cat6500 with IOS 12.2(18)SXF16 running spanning-tree mode rapid-pvst,
802.1w compliant switch running IEEE version of rapid STP

When those are connected by access ports, everything works as expected.
However, when connected by 802.1Q trunk with vlans 1500-1520, the
behaviour is this:

802.1w switch sending BPDUs to IEEE STP MAC address (0180.c200.0000)
Cat6500 sending per-vlan BPDUs to Cisco MAC address (0100.0ccc.cccd)
but nothing to IEEE STP MAC address

Aren't Cisco switches supposed to send BPDUs also to IEEE STP MAC address
on 802.1Q trunks? Or is there any special config needed for this?


   Thanks & kind regards,

         M.