Руководство По Проектированию для Cisco Cisco Nexus 5010 Switch
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Table 7.
Advantages and Disadvantages of Fabric Extender Straight-Through and Active-Active Topologies
Advantages
Disadvantages
Connection to Cisco Nexus 5000
Series
Series
Fabric extender
straight-through
topology
straight-through
topology
● Better support for FCoE
● More fabric extenders in the same
● More fabric extenders in the same
vPC domain
● Failure of one Cisco Nexus 5000
Series Switch could isolate single-
attached servers
attached servers
● vpc orphan-port suspend
configuration required for active-
standby teaming servers
standby teaming servers
Static pinning or PortChannels
Fabric extender
active-active topology
active-active topology
Supports single-attached servers or
dual-attached teaming with or without
PortChannels
dual-attached teaming with or without
PortChannels
Additional configuration needed
because both Cisco Nexus 5000
Series vPC peers control each
individual fabric extender
because both Cisco Nexus 5000
Series vPC peers control each
individual fabric extender
PortChannels
BPDU Filtering on Host Ports
BPDU filtering increases the scalability of the Layer 2 topology and reduces the load on the server for processing
control-plane traffic.
A host port configured on Cisco Nexus platforms for BPDU filtering sends out 10 BPDUs at link up. If no response
follows, the port assumes that the device connected to it is a server, and as a result the port stops sending BPDUs
to the device.
You can enable BPDU filtering by using this command:
nexus(config-if)# spanning-tree bpdufilter enable
On Cisco Nexus 2000 Series ports, BPDU filtering is enabled by default, as shown by the command show
spanning-tree interface <a/b> detail:
tc-nexus5k02(config-if)# show spanning-tree int eth101/1/37 deta
Port 677 (Ethernet101/1/37) of MST0000 is designated forwarding
Port path cost 20000, Port priority 128, Port Identifier 128.677
Designated root has priority 24576, address 001b.54c2.80c2
Designated bridge has priority 32768, address 000d.eca3.47fc
Designated port id is 128.677, designated path cost 0
Timers: message age 0, forward delay 0, hold 0
Number of transitions to forwarding state: 0
The port type is edge
Link type is point-to-point by default, Internal
Bpdu guard is enabled
Bpdu filter is enabled by default
PVST Simulation is enabled by default
BPDU: sent 11, received 0
Host ports should also be configured with spanning-tree port type edge to help ensure that the link begins
forwarding immediately at link up.