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16 Cards in this Set
- Front
- Back
What advantage do vPC's have over traditional Etherchannel links (3 bullets)?
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-vPC's allow single virtual uplink to a pair of upstream devices.
-The upstream devices are seen as a single logical switch, even though they are not. -Traffic can be load-balanced across multiple physical links to the upstream devices. |
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What are vPC Peers?
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They are a pair of Nexus devices that will act as a single logical switch for downstream device.
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What does the vPC Peer Link provide (10 bullets)?
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-It will create the illusion of a single logical control plane.
-It will forward BPDU's and LACP packets. -It will enable the devices to establish and maintain a primary/secondary relationship. -MAC tables will be synchronised across the Peer Link. -IGMP entries (for IGMP snooping) will be synchronised across the Peer Link. -It will transmit multicast traffic. -It will transmit traffic from Orphan Ports. -Will provide HSRP transmission. -It will transmit Cisco Fabric Services (CFS) traffic. -Unicast traffic may be carried under certain failure conditions. |
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What is Cisco Fabric Services (CFS) used for?
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This provides all the Sync technologies that enable vPC to work.
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What is the Peer Keepalive Link used for (3 bullets)?
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-This is a backup link to test the status of the vPC peers using keepalives.
-Keepalive messages are not sent over the Peer Link. -Data or Sync messages will not be sent over the Peer Keepalive Link. |
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If a N5K uplinks to a pair of N7K's, describe the config at each end of the link (2 bullets).
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-vPC will be configured on the N7K's.
-Normal Etherchannel will be configured on the N5K. |
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What is a vPC Member Port?
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It is a port that is part of the vPC on one of the VPC Peers.
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What is an Orphan Port? |
It is a port that connects to another device but is not participating in the vPC. |
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What is a vPC domain (2 bullets)? |
-All the components that make up the vPC config on a pair of vPC peers. |
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Name 2 limitations of vPC. |
-The Peer Link must use at least 1 x 10G port, 2 are recommended. |
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At what layer does vPC operate. |
L2, although L3 features such as HSRP can be used in conjunction with vPC. |
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Describe an example of dual-sided vPC. |
If a pair of N7K's were providing a vPC domain to a pair of N5K's, which were in turn providing a vPC domain to a pair of N2K's, this would be a dual-sided vPC configuration. |
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What info will the "show vpc brief" command display (3 bullets)?
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-vPC domain and Peer status.
-vPC Peer-Link status. -vPC status - i.e. the vPC link to the downstream switch. |
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What info will the "show vpc peer-keepalive" command display (2 bullets)?
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-Peer-Keepalive Status - status, interface, age, last update.
-Peer-Keepalive Parameters - IP details, timers, UDP port, TOS. |
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What info will the "show vpc role" command display (2 bullets)?
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-Role of the local switch.
-Local Role-Priority of the local switch (lower is better). |
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What command could you use to check that the vPC config on two peers matches?
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-"show vpc consistency-parameters" - global.
-"show vpc consistency-parameters interface port-channel 20" - per interface. |