Restrictions For Local Span And Rspan - Cisco ASR 920 Series Configuration Manual Ethernet Router

Restrictions for Local Span and RSPAN

RSPAN
• Before configuring RSPAN sessions, you must first configure:
• MAC learning should be disabled using the mac-address-table limit [rspan vlan/bd] maximum num
• RSPAN VLAN must be dedicated and entire Layer 2 devices in the network must be aware of the VLAN.
• RSPAN source and destinations switches separated by the VPLS pseudowire must be aware of the
• Pseudowire must be dedicated for RSPAN traffic.
• The RSPAN destination session is not required when the destination switch is connected to source switch
Restrictions for Local Span and RSPAN
Local Span
• Local SPAN is only supported on physical ports.
• SPAN monitoring of port-channel interfaces or port-channel member-links is not supported.
• Combined Egress local SPAN bandwidth supported is 1 GB.
• Local SPAN is not supported on logical interfaces such as VLANs or EFPs.
• Up to 14 active local SPAN sessions (ingress and egress) are supported. The router supports up to 14
• Only one local SPAN destination interface is supported. You cannot configure a local SPAN destination
• Outgoing Cisco Discovery Protocol (CDP) and Bridge Protocol Data Unit (BPDU) packets are not
• When enabled, local SPAN uses any previously entered configuration.
• When you specify source interfaces and do not specify a traffic direction (Tx, Rx, or both), both is used
• Local SPAN destinations never participate in any spanning tree instance. Local SPAN includes BPDUs
• Local SPAN sessions with overlapping sets of local SPAN source interfaces or VLANs are not supported.
Carrier Ethernet Configuration Guide (Cisco ASR 920 Series)
382
1 Source interface
2 Destination BD
action limit command before configuring the RSPAN VLAN.
RSPAN VLAN/ brige domain (BD).
through Layer2 VPN. Thus, in the destination switch, the destination port must configured with the
service instance with encapsulation as RSPAN VLAN/BD and bridge domain as RSPAN VLAN/BD
and the MAC address learning should be disabled on RSPAN BD/VLAN.
ingress sessions and up to 12 egress sessions.
interface to receive ingress traffic.
replicated.
by default.
in the monitored traffic, so any BPDUs seen on the local SPAN destination are from the local SPAN
source.
Configuring Switched Port Analyzer