The configuration will essentially be the same. Let’s assume we have three physical interfaces on each router, each on VLAN 1, VLAN 2 and VLAN 3. In order to simplify the specific topology, if I have understood it correctly, we can disregard the etherchannel and subinterface configurations. Take a look at this for more information: Keep in mind that the priority of an interface on a switch can dynamically change based on the Object Tracking functionality of HSRP. HSRP maintains this scenario until the standby HSRP router priority increases above the upper threshold. If the standby router priority falls below the lower threshold, HSRP sends all standby router traffic accross the vPC trunk to forward through the active HSRP router. The purpose of the forwarding-threshold keyword and its configuration parameters is to determine when a switch participating in HSRP/vPC is considered “down” so that the ports in the vPC will forward traffic only to the “good” switch. In such a virtual port channel, under normal conditions, vPS forwards traffic to both the active and standby switches with ports participating in the vPC.
vPC is a feature that is available on the Cisco Nexus series switches and allows the creation of a “Virtual” port channel where the physical ports of the port channel can span two switches that are functioning as an HSRP group. The addition of the forwarding-threshold keyword is used in conjunction with vPC (Virtual Port Channel). The priority command is used to determine which router will be the active router. Keep in mind that the forwarding-threshold keyword is used as part of the priority command. (Please note, when I refer to “switch” in the following paragraphs, I am referring to an 元 switch.) Switch1(config-if-hsrp)# priority 60 forwarding-threshold lower 40 upper 50 The default is 255.Īn example of this command is the following: Optionally, sets the upper and lower threshold values used by vPC to determine when to fail over to the vPC trunk. Cisco says that this command: Sets the priority level used to select the active router in an HSRP group. Let’s begin with Cisco’s explanation and we’ll go from there.