Ethernet Switches & Routers

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Occasional Contributor
Posts: 14
Registered: ‎02-09-2011
Accepted Solution

Redundant uplinks with mstp and different speed ports

Here is an exercise I'm trying to understand but haven't yet.

 

I've got 2 stacks connected together using 2 trunk port for 1Gig and 2 trunk ports for 10Gig.   Stack A is in the building and the root of the vlans, Stack B is in a remote building and in the layer3 Gateway for the vlans(the uplink).

 

What I'd like to do is remove the trunks and use a single 10Gig with a 1Gig backup.  In the near future, I'm expecting to be asked why we are burning up a 10G port for backup.

 

I've got the whole setup running but must be missing something.  My 10G port stays as a Backup and never takes a designated state.  If I shut off the 1Gig port the 10Gig will take over 30 seconds later.    

 

I'm thinking that the 10Gig (lower path cost) should takeover as designated. The mac address on the 1G port is lower but I'm assuming the lower pathcost of the 10G would overide the mac address.  Also I'd really like for the 1Gig to then become Alternate but I don't believe that is an option on a root bridge.

 

Below is the output of 802.1w detail for these 2 ports (1/1/1-1G and 1/3/1-10G) and some equipment information.

 

I most be assuming something that isn't true.  Can someone help me understand this? 

 

 

======================================================================
VLAN 1766 - MULTIPLE SPANNING TREE (MSTP - IEEE 802.1W) ACTIVE
======================================================================
BridgeId 0064748ef8daf0c0, forceVersion 2, txHoldCount 3

Port 1/1/1 - Role: DESIGNATED - State: FORWARDING
PathCost 20000, Priority 128, AdminOperEdge F, AdminPt2PtMac F
DesignatedPriority - Root: 0x0064748ef8daf0c0, Bridge: 0x0064748ef8daf0c0
ActiveTimers - helloWhen 0
MachineStates - PIM: CURRENT, PRT: DESIGNATED_PORT, PST: FORWARDING
TCM: ACTIVE, PPM: SENDING_RSTP, PTX: TRANSMIT_IDLE
Received - RST BPDUs 1, Config BPDUs 0, TCN BPDUs 0



Port 1/3/1 - Role: BACKUP - State: DISCARDING
PathCost 2000, Priority 128, AdminOperEdge F, AdminPt2PtMac F
DesignatedPriority - Root: 0x0064748ef8daf0c0, Bridge: 0x0064748ef8daf0c0
ActiveTimers - fdWhile 0 rbWhile 0 helloWhen 0 rcvdInfoWhile 0
MachineStates - PIM: CURRENT, PRT: BLOCKED_PORT, PST: DISCARDING
TCM: INACTIVE, PPM: SENDING_RSTP, PTX: TRANSMIT_IDLE
Received - RST BPDUs 2453, Config BPDUs 0, TCN BPDUs 0

 

 

------------------------

Stack A - FCX running FCXS07400d

Stack B - ICX6610 running FCXR07400g

 

-------------------------

MAc addresses: 

1/1/1 - 1G - 748e.f896.d180

1/3/1 - 10G - 748e.f896.d1b3

 

Occasional Contributor
Posts: 14
Registered: ‎02-09-2011

Re: Redundant uplinks with mstp and different speed ports

Don't know how I missed it but right there it is in the manual:

 

spanning-tree 802-1w ethe 1/3/1 priority 112

 

Guess I was looking for a single command across all vlans but this works as described on a vlan basis.

 

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