Rspan - Avaya 4000 Series Troubleshooting Instructions

RSPAN

Remote Switch Port ANalyzer (RSPAN), also known as Remote Port Mirroring, enhances port
mirroring by enabling mirrored traffic to be sent to one or more switches or stacks on the
network using an intermediate VLAN for forwarding the mirrored traffic.
Considerations
• Switches must support RSPAN VLAN configuration and flood traffic within that VLAN as
specified by the characteristics of an RSPAN VLAN.
• The RSPAN VLAN carries port mirroring and SPAN traffic between RSPAN source and
destination sessions. All traffic in the RSPAN VLAN is flooded and no MAC address
learning occurs on the RSPAN VLAN.
• RSPAN traffic may be terminated on a Avaya Switch supporting RSPAN.
• The maximum number of RSPAN vlans on a DUT is four
• Configure up to four RSPAN destination instances.
• You cannot use the same vlan or the same interface in another RSPAN instance.
Configuring ports
Install filters to enable port mirroring/ RSPAN source for MAC base modes (Asrc, Adst,
AsrcBdst, AsrcBdstOrBsrcAdst, AsrcOrAdst) and port based modes (XrxYtx, XrxYtxOrYrxXtx)
port-mirroring. If platform resource limits are reached, the application may not function in these
modes. RSPAN only works for unicast traffic for port based modes.
Broadcast/Multicast/UUC traffic does not use hardware filters, it uses a group of workarounds
that must be removed in order for RSPAN to work.
Note:
Port-mirroring shows incorrect source/dest mac for routed layer 3 traffic because mirroring
is the last operation performed by the ASIC (after routing).
You cannot configure a port under the following conditions:
• A port has 802.1X enabled as an RSPAN destination port
• A port is a member of MLT/DMLT/LAG as an RSPAN destination port
• A port is a member of MLT/DMLT/LAG as a port mirroring/RSPAN source because this
functionality has never been implemented for the classic PMT and there is a restriction
which does not allow you to configure a MLT/DMLT/LAG port as MTP.
• A port cannot be configured as an RSPAN destination or Mirror To Port (MTP) if it is an
RSPAN source / mirrored port for another instance.
• You cannot configure allow-traffic option and RSPAN because the port must be in a
enabled and disabled state at the same time.
Troubleshooting Avaya ERS 4000 Series
RSPAN
April 2014 27