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l00k3r_53179's avatar
l00k3r_53179
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Apr 23, 2013

MSTP issue with Cisco switch

Good morning everybody, After months of passive reading, the time has come for my first forum post. Hope this is the right section for this topic. To simplify my topology, I have an F5 3600 ...
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l00k3r_53179's avatar
l00k3r_53179
Icon for Nimbostratus rankNimbostratus
Apr 23, 2013

Thanks What Lies Beneath for your quick response.

Well, yes I must have misunderstood F5's output. The fact is that for instances 1 and 2, the regional root bridge MAC address listed by F5 is itself, so I was confused:

root@F5(Standby)(tmos) show net vlan

Net::Vlan: 603
-------------------------------
Interface Name  603
Mac Address     0:1:d7:be:e5:44

Net::Interface
Name  Status  Bits  Bits  Errs  Errs   Drops  Drops  Colli
                In   Out    In   Out      In    Out  sions
----------------------------------------------------------
1.7       up  2.4G  1.4M     0     0  880.8K      0      0


Net::Vlan: 600
-------------------------------
Interface Name  600
Mac Address     0:1:d7:be:e5:45

Net::Interface
Name  Status  Bits  Bits  Errs  Errs  Drops  Drops  Colli
                In   Out    In   Out     In    Out  sions
---------------------------------------------------------
1.5       up  8.5G  2.6G     0     0   1.9M      0      0

As per the active F5... well at the moment they are both standby because I configured VLAN failsafe on both vlans.

This is the second F5's output:

root@F5-2(Standby)(tmos) show net vlan

Net::Vlan: 600
-------------------------------
Interface Name  600
Mac Address     0:1:d7:d4:77:85

Net::Interface
Name  Status  Bits    Bits  Errs  Errs   Drops  Drops  Colli
                In     Out    In   Out      In    Out  sions
------------------------------------------------------------
1.6       up  3.3G  536.7M     0     0  305.2K      0      0

Net::Vlan: 603
-------------------------------
Interface Name  603
Mac Address     0:1:d7:d4:77:84

Net::Interface
Name  Status  Bits   Bits  Errs  Errs   Drops  Drops  Colli
                In    Out    In   Out      In    Out  sions
-----------------------------------------------------------
1.8       up  1.4G  12.0K     0     0  426.6K      0      0


[root@F5-2:Standby] config  b stp
STP   MODE mstp
|     Forward delay 15   Hello time 2   Max age 20   Transmit hold 6
|     Max hops 20   Revision 1   ID MSTP-PFQ-PUB
+-> STP INSTANCE 0   priority 49152   root bridge 04:DA:D2:CC:B0:00
|   |     regional root bridge 00:01:D7:D4:77:80
|   |     No topology changes
none+-> STP INSTANCE 1   priority 49152   regional root bridge 00:01:D7:D4:77:80
|   |     No topology changes
|   +-> STP VLAN 1/600
|       +-> STP INTERFACE 1/1.6
|           |     path cost 20000   priority 128   role master
|           |     state forward (forward)   link p2p   not edge - auto
+-> STP INSTANCE 2   priority 49152   regional root bridge 00:01:D7:D4:77:80
    |     No topology changes
    +-> STP VLAN 2/603
        +-> STP INTERFACE 2/1.8
            |     path cost 20000   priority 128   role alternate
            |     state block (block)   link p2p   not edge - auto

The configuration is the same.