Cisco WS-X6416-GE-MT - Interface Module - Expansion Manual do Utilizador descarregar pdf (Página 42)

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Remote SPAN (RSPAN)

Remote SPAN retains most of the functionality of SPAN and adds support for source and

destination ports distributed across multiple switches in a network. Traffic for RSPAN is carried

over a user-specified RSPAN VLAN dedicated for that RSPAN session in all participating switches.

RSPAN sessions can coexist with SPAN sessions with a maximum of 30 SPAN/RSPAN sessions

per switch. In the following example configurations, VLAN 10 is configured as an RSPAN VLAN

and VLAN 5 is configured as the RSPAN source port to monitor both incoming and outgoing

traffic:

Cisco Catalyst OS Cisco IOS Software

Set vlan 10 rspan

Set rspan source 5 10 both

Set rspan destination 3/1 10

Show rspan

IOS(config)#vlan 10

IOS(config-vlan)#remote-span

IOS(config)#monitor session 1 source vlan 5 both

IOS(config)#monitor session 1 destination remote-vlan 10

IOS#sh monitor session 1

Encapsulated Remote SPAN (RSPAN)

Introduced with Cisco IOS Software Release 12.2(18)SXE, the Cisco Catalyst 6500 uses the

hardware acceleration of GRE on the Cisco Catalyst 6500 Supervisor Engine 32 and Cisco

Catalyst 6500 Series Supervisor Engine 720 to allow network monitoring to extend beyond a Layer

3 boundary. ERSPAN is used to monitor a remote network’s Layer 2 traffic and conserve

resources by removing the requirement of the duplication of network probes across all Layer 2

networks. (See Figure 9.)

Figure 9. ERSPAN

ERSPAN and SPAN can monitor all traffic, including multicast and bridge protocol data unit

(BPDU) frames, where RSPAN does not support BPDU monitoring. The following is a configuration

example of ERSPAN.

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Cisco WS-X6416-GE-MT - Interface Module - Expansion Manual do Utilizador Página 42