What is vPC keepalive?
vPC Peer-Keepalive Link – Connects both vPC peer switches and carries monitoring traffic to/from each peer switch. Monitoring is performed to ensure the switches are both operational and running vPC. vPC Peer Link – Connects both vPC peer switches and carries BPDUs, HSRPs, and MAC addresses to its vPC peer.
What happens if vPC keepalive fails?
vPC keep-alive link failure: If only keep-alive fails, nothing will happen. Only heartbeat between Primary and Secondary node will be lost.
How does STP work in vPC?
STP Behavior in vPC: vPC system is created to avoid the STP blocked ports and hence provide the loop free layer -2 topology. In vPC STP provide the following function: Protect the Layer 2 network by detection and breaking any loops before vPC configuration. Provides the loop free path for non-vPC attached device.
What is Bridge assurance in vPC?
–> Bridge Assurance is one of the STP features that is used to avoid switching loops in your network. –> When bridge assurance is configured on the switch then BPDUs are sent on all interfaces of the switch, including blocked interfaces like the alternate or backup port.
What is Orphan port in vPC?
vPC orphan port is the which ports are not the part of vPC, those port known as orphan ports. For example, if any servers have single connectivity with only Nexus-1 switch so we cannot configure the vPC on single end-host connectivity this port will be an orphan port.
How can we prevent split brain in vPC?
Best practice is to avoid the split brain scenario all together.
- Configure the peer-link and the keep-alive from entirely independent resources.
- Create a port-channel for the keep-alive.
- Use a dedicated sub-interface for the keep-alive.
How do I check my vPC consistency?
vPC consistency check Configuration
- Type 1 – Puts peer device or interface into a suspended state to prevent invalid packet forwarding behaviour. With vPC Graceful Consistency check, suspension occurs only on the secondary peer device.
- Type 2 – Peer device or Interface still forward traffic.
What is bridge assurance in vPC?
How many switches can be in a vPC domain?
two
The maximum number of switches in a vPC domain is two. The maximum number of vPC peers per switch or VDC is one. When Static routing from a device to vPC peer switches with next hop, FHRP virtual IP is supported. Dynamic routing adjacency from vPC peer switches to any Layer3 device connected on a vPC is not supported.
What is the difference between VSS and stacking?
A VSS will allow two physical Cisco Catalyst Series Switches to operate as a single logical virtual switch called a virtual switching system….Comparison Table: Stacking vs VSS.
| FEATURE | STACKING | VSS |
|---|---|---|
| Distance Supported | Limited by distance | VSS members can be in geographically distant locations |
What is Cisco VSL?
VSL is used to carry on proprietary encapsulated frames also control plane messages to form a single device, one supervisor the active one controls both chassis with second supervisor acting as hot standby as in a single chassis with two supervisors.