Vpc Peer Links - Cisco 7604-RSP720C-R Configuration Manual

Information About vPCs
S e n d d o c u m e n t c o m m e n t s t o n e x u s 7 k - d o c f e e d b a c k @ c i s c o . c o m
Figure 7-3
vPC
primary
device
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•
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vPC Peer Links

A vPC peer link is the link that is used to synchronize the states between the vPC peer devices. Both
ends of the link much be on 10-Gigabit Ethernet interfaces.
Since vPC includes a split control plane working on two switches, vPC uses the peer link as follows:
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This section describes the vPC peer link and includes the following topics:
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Cisco Nexus 7000 Series NX-OS Interfaces Configuration Guide, Release 5.x
7-6
Separate Switch Required to Connect Management Ports for vPC Peer-Keepalive Link
Peer-keepalive link
vPC peer link
Port
channel
1
Catalyst
Series 6500
switch
Standby
Active
No data or synchronization traffic moves over the vPC peer-keepalive link; the only traffic on this
link is a message that indicates that the originating switch is operating and running vPC.
vPC member port—Interfaces that belong to the vPCs.
Dual-active— Both vPC peers act as primary. This situation occurs when the peer-keepalive and
peer-link go down when both the peers are still active. In this case, the secondary vPC assumes that
the primary vPC is inactive and acts as the primary vPC.
Recovery—When the peer-keepalive and the peer-link come up, one switch becomes the secondary
vPC. On the switch that becomes the secondary vPC, the vPC links go down and come back up.
Keeps both vPC peer switches in sync for control plane info (such as vPC state, consistency
parameters, and MAC addresses).
Forwards data packets to the vPC peer switch, when the local vPC is down.
A single vPC domain between two VDCs on the same physical Cisco Nexus 7000 device is not
supported.
vPC Peer Link Overview, page 7-8
Management
switch
vPC
secondary
device
Port
channel
2
Catalyst
Series 6500
switch
Chapter 7 Configuring vPCs
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