Руководство По Проектированию для Cisco Cisco Nexus 5010 Switch
Design Guide
© 2010 Cisco and/or its affiliates. All rights reserved. This document is Cisco Public Information.
Page 5 of 38
Figure 3 illustrates the main vPC components. Switches 1 and 2 are the vPC peer switches. The vPC peer switches
are connected through a link called a peer link, also known as a multichassis EtherChannel trunk (MCT).
Figure 3 shows devices (switch 3, switch 4, and server 2) that are connected to the vPC peers (which could be Cisco
Nexus 7000 or 5000 Series Switches). Switches 3 and 4 are configured with a normal PortChannel configuration,
switches 1 and 2 are configured with a virtual PortChannel
Figure 3. vPC Components
vPC Peer Link
The vPC peer link is the most important connectivity element in the vPC system. This link is used to create the
illusion of a single control plane by forwarding Bridge Protocol data units (BPDUs) or Link Aggregation Control
Protocol (LACP) packets to the primary vPC switch from the secondary vPC switch.
The peer link is used to synchronize MAC addresses between aggregation groups 1 and 2, to synchronize IGMP
entries for the purpose of IGMP snooping, it provides the necessary transport for multicast traffic and for the
communication of or
phaned ports. The term “orphaned ports” refers to switch ports connected to single-attached
hosts, or vPC ports whose members are all connected to a single vPC peer.
In the case of a vPC device that is also a Layer 3 switch, the peer link also carries Hot Standby Router Protocol
(HSRP) frames.