A client has the following configuration:
The entire network is on VLAN1, with the subnet 172.16.0.0/16 - performing a redesign of their network is not an option at this point, as they're a 24/7 facility that cannot currently afford downtime (yeah, I know).
The client wishes to trunk two switches together:
1: Cisco 6509 running IOS 12.3
2: Dell F10 S48-10
The Cisco 6509 module 8 is equipped with 10gbps links - the client wants to use four of those links to trunk to the Force10. The problem that I have run into is that the Force10 does not allow tagged traffic on VLAN1, and spanning-tree pvst on the S48-10 rejects the untagged BPDU on VLAN1 from the 6509.
I've tried this configuration with the following settings - the LACP link works, but the Force10 rejects the BPDU from VLAN1 of the Cisco switch saying "Rejected untagged BPDU on VLAN1", and subsequently shuts the port down. Attempting to tag VLAN1 fails on the Force10 - that functionality is not allowed.
Force 10 Configuration
protocol spanning-tree pvst no disable ! ! interface range Te0/40 - 43 description Port Channel 2 Member no ip address ! port-channel-protocol LACP port-channel 2 mode active no shutdown ! interface Port-channel 2 description TenGig Uplink to Cisco 6509 no ip address switchport no shutdown
Cisco 6509 configuration
! spanning-tree mode pvst ! interface range TenGigabitEthernet8/1 - 4 switchport switchport mode trunk channel-protocol lacp channel-group 2 mode active ! interface port-channel2 no ip address switchport switchport trunk encapsulation dot1q switchport mode trunk no shutdown !
I feel that either I'm missing something very simple, or this may need to be fully converted off VLAN1 before the configuration will function. I was able to try every variant of this configuration that I could, except for forcing "trunk native vlan 1" on the Cisco side. I have not been able to obtain equipment to sandbox this configuration yet. :(