Can a vPC be Layer 3?
vPC Domain With Layer 3 Enabled on Only One Switch The general rule for vPC is that the two devices participating in the vPC domain must have the same functions and capabilities. Figure 5-11 shows an example of a nonfunctional topology where Layer 3 is enabled on only one switch.
What is vPC keepalive?
vPC Peer-Keepalive- vPC Peer-keepalive is a routed (Layer-3) link between both peer switches (Nexus-1 & Nexus-2). The purpose of this link is to check the liveness of peer switch. This link will be a segregated link from the others or subnet, it can be in different vrf.
Can vPC be formed between 2 Vdcos on the same device?
Yes, you can do it there is no issue.
What does layer3 peer router do?
This enable either switch to accept packets on behalf of it’s peer. The second command is layer3 peer-router. This is the command that tells the Nexus to not decrement the TTL.
What is vPC peer gateway?
The vPC peer-gateway functionality allows a vPC switch to act as the active gateway for packets that are addressed to the router MAC address of the vPC peer. This feature enables local forwarding of such packets without the need to cross the vPC peer-link.
What is dual vPC?
In double-sided vPC, two access switches are connected to two aggregation switches whereas in single-sided vPC, one access switch is connected to two aggregation switches. Provides more bandwidth from the access to aggregation layer.
What is the difference between lag and MLAG?
MLAG is the ability of switches to appear as a single switch at layer 2, so that bundles of links in the form of LAGs can be diversely connected to each switch and appear as one. LAGs are typically created North & South i.e. between host and switch, whereas MLAG is created and expanded in an East & West direction.
What is MLAG domain?
The MLAG domain ID is a text string configured in each peer switch. MLAG switches use this string to identify their peers. The MLAG System ID (MSI) is the MLAG domain’s MAC address. The MSI is automatically derived when the MLAG forms and does not match the bridge MAC address of either peer.
How many ports can be in a vPC?
Single Homed Fabric Extender vPC Topology The Cisco Nexus 5000 Series switch can support up to 12 configured single homed Fabric Extenders (576 ports) with this topology however only 480 dual homed host servers can be configured in a vPCs with this configuration.
What is vPC peer switch?
The vPC peer switch is introduced to address performance concerns around these STP convergence events. This feature allows a pair of Cisco Nexus 7000 Series devices to appear as a single STP root in the Layer 2 topology. In the vPC peer switch mode, STP BPDUs are sent from both vPC peer devices.
What is vPC peer-link?
A VPC peering connection is a networking connection between two VPCs that enables you to route traffic between them using private IPv4 addresses or IPv6 addresses. Instances in either VPC can communicate with each other as if they are within the same network.
What is primary and secondary vPC?
Primary and Secondary Roles One vPC peer holds the primary role, and the other holds the secondary. By default, only the primary switch responds to control plane traffic. For example, when traffic such as an ARP request is sent to the domain, the primary switch responds.
How many vPC can be created in Nexus?
In particular, each VDC for the Nexus 7000 Series switches requires its own vPC peer and keepalive links and cannot be shared among the VDCs. The maximum number of switches in a vPC domain is two. The maximum number of vPC peers per switch or VDC is one.
What is MLAG networking?
A multi-chassis link aggregation group (MLAG or MC-LAG) is a type of link aggregation group (LAG) with constituent ports that terminate on separate chassis, primarily for the purpose of providing redundancy in the event one of the chassis fails.
What is peer gateway in vPC?
What is lag and MC-LAG?
An MC-LAG provides redundancy and load balancing between the two MC-LAG peers, multihoming support, and a loop-free Layer 2 network without running STP. On one end of an MC-LAG, there is an MC-LAG client device, such as a server, that has one or more physical links in a link aggregation group (LAG).