Cisco WS-X6248-RJ-45 - Catalyst 6000 Expansion Module Manual de usuario descargar pdf (Pagina 22)

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All three of these enhancements to PVST+ are supported in both CatOS and Cisco IOS Software; the conﬁguration

commands are shown here.

Root and BPDU Guard Conﬁguration

The port-based BPDU Guard feature monitors to see if a BPDU is received on an unauthorized port. If a BPDU is

received on an access port, spanning tree shuts down these conﬁgured interfaces, rather than putting them into the

spanning-tree blocking state. Reception of a BPDU by a PortFast-conﬁgured interface signals an invalid

conﬁguration, such as the connection of an unauthorized device. The BPDU guard feature provides a secure response

to invalid conﬁgurations since the interface is only re-enable manually by the administrator or automatically via the

error-disable feature. The spanning-tree root guard feature forces an interface to become a designated port, and if

any device accessible through the interface tries to become the root bridge, the root guard feature puts the interface

into the root-inconsistent (blocked) state.

Cisco IOS Software supports BPDU Guard and Root Guard feature on switchports only. The conﬁguration dialog

below shows highlights conﬁguration differences.

EtherChannel

EtherChannels in CatOS and Cisco IOS Software bundle individual Ethernet links into a single logical link that

provides bandwidth aggregation and link resilience in a network. Cisco Catalyst 6500 Ethernet interfaces support

up to eight interfaces per EtherChannel with all interfaces at the same speed: 10, 100, 1000, or 10,000 Mbps.

EtherChannel groups can include ports on any combination of line cards.

EtherChannel Operation

Conﬁguring EtherChannels in the Cisco IOS Software is a two-step process: ﬁrst you assign the ports to a

channel-group and then you create and conﬁgure the virtual interface port-channel. The virtual interface

port-channel behaves like a physical interface. As in CatOS, all conﬁgurations on the port channel interfaces are

propagated to the physical interfaces of the port channel. For example, shutting the port channel interface will shut

all physical ports on that port channel. To change parameters of all ports in an EtherChannel, the conﬁguration

CatOS Cisco IOS Software

set spantree uplinkfast enable

set spantree backbonefast enable

set spantree portfast 3/1 enable

IOS(config)# spanning-tree uplinkfast

IOS(config)# spanning-tree backbonefast

IOS(config)# int range fa3/1

IOS(config-if)# switchport

IOS(config-if)# spanning-tree portfast

CatOS Cisco IOS Software

set spantree bpdu-guard 3/1 enable

set spanning-tree guard root 1/1

show spantree summary

IOS(config)# int range fast3/1

IOS(config-if)# switchport

IOS(config-if)# spanning-tree portfast bpduguard

IOS(config-if)# spanning-tree guard root

IOS# show spanning-tree summary

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