Tony Mattke, Chris Marget, and Jeff Fry continue a discussion begun in Priority Queue Show 007 with Ethan Banks about deploying virtual port-channel technology with the Cisco Nexus 5K and 7K series of switches in this continuation of the Cisco Nexus deep-dive podcast series.
What We Discuss
- Traffic-flow through a virtual port-channel infrastructure.
- HSRP behavior in a vPC domain.
- Spanning-tree convergence enhancement: both switches get to act as the same root, so if one fails the other takes over with no change to the STP topology.
- Auto-recovery – bringing up ports in a vPC domain after a disruptive power failure.
- ARP & other table synchronization between vPC switches.
- vPC loop prevention algorithm – preventing traffic from going round and round.
- LACP vs. PAgP vs. “mode on” in a vPC domain.
- Spanning-tree notes – bridge assurance (bi-directional BPDU flow) & edge-type ports.
- UDLD: to run, or not to run?
- Notes on IGMP snooping: don’t disable it!
- We mention FabricPath. You know…briefly.
- Cisco Virtual PortChannel Quick Configuration Guide
- Auto recovery
- Understanding Bridge Assurance
- Brad Hedlund on leaf-spine architecture & design considerations