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satish_txt_2254's avatar
satish_txt_2254
Icon for Cirrus rankCirrus
Apr 26, 2017

STP issue with Nexus 5548

We have above network and here is the cisco trunk configuration. Nexus 5548 interface Ethernet1/9 description F5-10G-Link switchport mode trunk switchport trunk allowed vlan 201 ...
application delivery
BIG-IP
crengifo_232216's avatar
crengifo_232216
Icon for Nimbostratus rankNimbostratus
Apr 27, 2017

Assuming that you haven't configured the priority on the root switch for VLAN 201, you can try this (in config mode):

 

  • non-root switch: spanning-tree vlan 201 priority 40960
  • Nexus switch: spanning-tree vlan 201 priority 36864
satish_txt_2254's avatar
satish_txt_2254
Icon for Cirrus rankCirrus
May 12, 2017

Unfortunately i have tried (RSTP, MSTP, STP etc) everything and no luck, Problem is Cisco switches running on Rapid-PVSTP+ and F5 doesn't understand this protocol.

 

In transparent mode 2G link turn into ACTIVE instead of 10G but when i try to shutdown 2G link 10G goes into loop-guard and switch never bring that port up.

 

In Lab i configure MSTP on cisco switch and MSTP on F5 in that case everything was working great.

 

Bottom line is F5 never work with PVSTP spanning-tree, if anyone did or hack something please let me know i really want that solution.