Forum Discussion
Feb 13, 2015
Hi Gambler,
by configuring a VLANgroup you create a L2 connection between internal and external VLAN. Is this technically required? Same L2 broadcast domain? Whenever possible I avoid using VLANgroups. In case you have assigned VLANs in "tagged" mode to interfaces on the F5 you will need a corresponding "trunk" (Cisco terminology for VLAN tagging) on the Cisco gear. By using VLAN tagging a single link or aggregated links (aka F5 trunk, aka Cisco channel) can be associated with multiple VLANs. For troubleshooting on the F5 the tcpdump will help you:tcpdump -nnni 0.0 -e -c 1000
The "-e" parameter dumps L2 information (MAC address and vlan tag), the "-nnni 0.0" is dumping on all interfaces and prevents all level name resolution, the "-c 1000" just limits the number of packets to dump.
Perhaps you are already aware of all these aspects and I misunderstood your question. Thanks, Stephan