Marian Ďurkovič wrote:
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
Generally, no. Vlan 1 is treated specially.
on 802.1Q trunks? Or is there any special config needed for this?
Vlan number 1 will interop, so if you do this:
int Gi1/1
switchport mode trunk
switchport trunk native vlan 1
switchport trunk allowed vlan 1,2,3
...then vlan 1 will form an 802.1w adjacency with the neighbour, vlans 2
and 3 will just pass straight through it.
In general, PVST passes straight through non-PVST switches; the non-PVST
switches appear as if they're shared segments.
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