Cisco Systems N5KC5596TFA manual Configuring a Hybrid vPC Peer Switch Topology, pseudo-information

Configuring Virtual Port Channels

Configuring a Hybrid vPC Peer Switch Topology

This example shows how to configure a pure vPC peer switch topology:

switch# configure terminal

Enter configuration commands, one per line. End with CNTL/Z. switch(config)# vpc domain 5 switch(config-vpc-domain)# peer-switch

2010 Apr 28 14:44:44 switch %STP-2-VPC_PEERSWITCH_CONFIG_ENABLED: vPC peer-switch configuration is enabled. Please make sure to configure spanning tree "bridge" priority as

per recommended guidelines to make vPC peer-switch operational. switch(config-vpc-domain)# exit

switch(config)# spanning-tree vlan 1 priority 8192 switch(config)# show spanning-tree summary Switch is in rapid-pvst mode

Root bridge for: VLAN0001-VLAN0050, VLAN0100-VLAN0149, VLAN0200-VLAN0249

VLAN0300-VLAN0349, VLAN0400-VLAN0599, VLAN0900-VLAN0999
Port Type Default		is disable
Edge Port [PortFast] BPDU Guard Default		is disabled
Edge Port [PortFast] BPDU Filter Default		is disabled
Bridge Assurance		is enabled
Loopguard Default		is disabled
Pathcost method used		is short
vPC peer-switch		is enabled (operational)
Name	Blocking Listening Learning Forwarding STP Active

---------------------- -------- --------- -------- ---------- ----------

VLAN0001	0	0	0	16	16
VLAN0002	0	0	0	16	16
switch(config)# copy running-config startup-config
switch(config)#

Configuring a Hybrid vPC Peer Switch Topology

You can configure a hybrid vPC and non-vPC peer switch topology by using the spanning-tree pseudo-information command to change the designated bridge ID so that it meets the STP VLAN-based load-balancing criteria and then change the root bridge ID priority to a value that is better than the best bridge priority. You then enable the peer switch. For more information, see the command reference for your device.

Note If you previously configured global spanning tree parameters and you subsequently configure spanning tree pseudo information parameters, be aware that the pseudo information parameters take precedence over the global parameters.

Before You Begin

Ensure that you have enabled the vPC feature.

Procedure

	Command or Action
Step 1	switch# configure terminal
Step 2	switch(config)# spanning-tree
	pseudo-information

Purpose

Enters global configuration mode.

Configures the spanning tree pseudo information.

Note This configuration takes precedence over any global spanning tree configurations.

	Cisco Nexus 5000 Series NX-OS Interfaces Configuration Guide, Release 5.2(1)N1(1)
94	78-26881-OL