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vsf link 2 "connected to self"

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  • 1.  vsf link 2 "connected to self"

    Posted 10 days ago
    Hi all,
    today I was configuring a vsf between 2 switches.
    So the first switch I configured this:
    (config)# vsf member 1 link 1 ethernet 1
    All configuration on this port has been removed and port is placed in VSF mode.
    (config)# vsf member 1 link 2 ethernet 2
    All configuration on this port has been removed and port is placed in VSF mode.
    (config)# wr m
    (config)# vsf enable domain 1
    This will save the current configuration and reboot the switch.
    Continue (y/n)?  y
    ​

    The second switch, I configured this:
    (config)# vsf member 2 link 1 ethernet 1
    All configuration on this port has been removed and port is placed in VSF mode.
    (config)# vsf member 2 link 2 ethernet 2
    All configuration on this port has been removed and port is placed in VSF mode.
    (config)# wr m
    (config)# vsf enable domain 1
    This will save the current configuration and reboot the switch.
    Continue (y/n)?  y
    ​


    I asked our local guy to connect port 1 to 1 and port 2 to 2. Now I see an error when I execute
    show vsf link detail:
    # sho vsf link
    
     VSF Member 1
    
                      Link     Peer   Peer
     Link Link-Name   State    Member Link
     ---- ---------- -------- ------ ----
     1    I-Link1_1   Up       2      1
     2    I-Link1_2   Down     0      0
    
    
     VSF Member 2
    
                      Link     Peer   Peer
     Link Link-Name   State    Member Link
     ---- ---------- -------- ------ ----
     1    I-Link2_1   Up       1      1
     2    I-Link2_2   Down     0      0
    
    
    
    # sho vsf link detail
    
    VSF Member: 1 Link: 1
    
    Port State
    -------- ------------
    1/1 Up: Connected to port 2/1
    
    
    VSF Member: 1 Link: 2
    
    Port State
    -------- ------------
    1/2 Error: No response from peer
    
    
    VSF Member: 2 Link: 1
    
    Port State
    -------- ------------
    2/1 Up: Connected to port 1/1
    
    
    VSF Member: 2 Link: 2
    
    Port State
    -------- ------------
    2/2 Error: Port connected to self
    ​
    

    I tried solving this by disabling the port with the error "connected to self" and enabling it again. The result: this error moved to the other port of link 2 (originally, it was on 1/2).

    Both switches run on 16.10.0016 

    How can I solve this so both links are being used?



  • 2.  RE: vsf link 2 "connected to self"
    Best Answer

    Posted 10 days ago
    Hi, 
    VSF stacks consisting of 2 members don't support ring topology, only chain. That means you can have only one VSF link between both switches. However you can add more than one physical ports to an VSF link. For example you can add ethernet 1 and 2 to VSF link 1

    (config)# vsf member 1 link 1 ethernet 1
    (config)# vsf member 1 link 1 ethernet 2

    ------------------------------
    Emil Gogushev
    ------------------------------



  • 3.  RE: vsf link 2 "connected to self"

    Posted 10 days ago
    Thanks Emil!
    That seems to work. 2 small extra questions:
    • How many physical links can one vsf link have?
    • Is the aggregate bandwidth between the 2 members equal to the sum of the bandwidth of the physical ports?



  • 4.  RE: vsf link 2 "connected to self"

    Posted 10 days ago
    Hello, 
    Small correction. You can add the physical interfaces in a single command. Here we add Port 1 and 2 to VSF Link 1.

    (config)# vsf member 1 link 1 ethernet 1 2

    A VSF link can have up to 8 physical links.
    The manual calls it a "load balanced aggregate VSF connection". So it works similar to a link aggregation (a.k.a trunk on this switch). So traffic will be load balanced over both ports in an active/active manner.

    ------------------------------
    Emil Gogushev
    ------------------------------