I have been doing lab work in preparation for the 300-115 test schedule for next week. Specifically, I was working on Ether-channel configurations and then transitioned to configuring MSTP utilizing the previously configured links (2 ports bundled into and Ether-channel). It's a basic config with 6 VLAN's and 3 MST instances (0,1,2) and the VLAN's distributed evenly between instance 1 and 2 . After successfully configuring MSTP, the stp info for instance 1 & 2 comes back with "No mst information available for instance(s) 1 or 2.
This happened whether I used PAgP, LACP or the "On" configuration
When I utilized 802.1q trunks between the devices, MSTP worked as expected.
I've searched and read a bunch of documentation and can't find a specific statement that MSTP can or can't be used over Ether-channel.
Can anyone help upgrade my knowledge in this area? Thank you in advance.
HW: 3X3560G running 12.2(55)SE10
Associated Info"
Group Port-channel Protocol Ports
------+-------------+-----------+-----------------------------------------------
13 Po13(SU) LACP Gi0/43(P) Gi0/44(P)
23 Po23(SU) LACP Gi0/45(P) Gi0/46(P)
SW3#sh spann
SW3#sh spanning-tree mst 0
##### MST0 vlans mapped: 1-9,11-19,21-29,31-39,41-49,51-59,61-4094
Bridge address 0021.a1b8.1680 priority 32768 (32768 sysid 0)
Root address 0019.30d1.0880 priority 32768 (32768 sysid 0)
port Po23 path cost 0
Regional Root address 0019.30d1.0880 priority 32768 (32768 sysid 0)
internal cost 10000 rem hops 19
Operational hello time 2 , forward delay 15, max age 20, txholdcount 6
Configured hello time 2 , forward delay 15, max age 20, max hops 20
Interface Role Sts Cost Prio.Nbr Type
---------------- ---- --- --------- -------- --------------------------------
Po13 Desg FWD 10000 128.152 P2p
Po23 Root FWD 10000 128.232 P2p
SW3#sh spanning-tree mst 1
No mst information available for instance(s) 1.
SW3#sh spanning-tree mst 2
No mst information available for instance(s) 2.
