How do I create a vPC port channel?
To create a vPC peer link you configure an EtherChannel on one Cisco Nexus 5000 Series switch by using two or more Ethernet ports. On the other switch, you configure another EtherChannel again using two or more Ethernet ports. Connecting these two EtherChannels together creates a vPC peer link.
What are Virtual port channels?
vPC’s, or Virtual Port Channels, are a Cisco Nexus technology. They are used to connect layer-2 devices to two switches at once. This makes it possible to create a highly available environment in the data centre. If one switch fails, the other one continues to operate.
What is port channel and virtual port channel?
vPC (Virtual Port-Channel), also known as multichassis EtherChannel (MEC) is a feature on the Cisco Nexus switches that provides the ability to configure a Port-Channel across multiple switches (i.e. vPC peers). vPC is similar to Virtual Switch System (VSS) on the Catalyst 6500s.
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 port channel and vPC?
Here you can see that Virtual Port channel (vPC) is configured using the interfaces of two switches. One of the key difference between the two technologies (port-channel and virtual port-channel ) is that port channels support both Layer 2 and Layer 3. vPC on the other hand only supports Layer 2.
Does vPC use LACP?
Question 2: “is LACP recommended for vPC?” – Yes. Just like a normal port-channel, it is always advised to use control protocol for vPC/port-channel to save us from big troubles.
What is the difference between vPC and VSS?
2) In VSS there will be single control plane for both the switches, where as in vPC there will be separate control plane for every switch. 3) VSS can support L3 port-channels across multiple chassis,however, vpc is used for L2 port-channels only.
What is VDC Cisco?
Virtual Device Contexts (VDC) allow you to carve out multiple virtual switches from a single physical Nexus switch. The number of VDCs that can be created is dependent upon the version of NX-OS, the Supervisor model and the license installed.
Should I use LACP or PAGP?
PAGP provides the same negotiation benefits as LACP. Both LACP and PAGP packets are exchanged between switches over Etherchannel capable ports….LACP vs PAGP: How They Differ From Each Other?
| Parameters | LACP | PAGP |
|---|---|---|
| Vendors Supported | Open Standard | Cisco Proprietary |
| Standard | Etherchannel and IEEE 802.3ad | Etherchannel |
What is the difference between MLAG and vPC?
MLAG is a public protocol which could be supported by almost every vendor using their own custom rolled implementation, while vPC is a Cisco Nexus specific protocol, not all the vendors could have this technology in hand. Thus, MLAG setup is a bit easier than vPC.
What is split brain in vPC?
Basically, in the vPC world, all links are set to forward, and nothing blocks at layer-2 because Spanning Tree is not really in place here. Cisco calls it a “split-brain” scenario. If that vPC peer-link fails for any reason, both switches assume the role of primary. This then creates the forwarding-loop-from-hell.
How does Cisco LACP work?
LACP packets are exchanged only between ports in passive and active modes. The protocol “learns” the capabilities of LAN port groups dynamically and informs the other LAN ports. After LACP identifies correctly matched Ethernet links, it facilitates grouping the links into an EtherChannel.