•
A maximum number of 20 facility loopback sessions can be created per system, provided 16 sessions
are with Dot1Q and 4 sessions are with Dot1Q and destination MAC address. This scale reduces if SPAN
or RSPAN is configured. This scale is supported on the Cisco ASR 900 Series RSP2 module.
•
A maximum number of 12 terminal loopback sessions can be created per system, provided 8 sessions
are with Dot1Q and 4 sessions are with Dot1Q and destination MAC address. This scale reduces if
RSPAN or SADT is configured. This scale is supported on the Cisco ASR 900 Series RSP2 module.
•
Only one Ethernet loopback (terminal or facility) session can be active on an EFP at any instance.
•
Local SPAN and ELB cannot be enabled on a physical interface at the same time.
•
Loopback sessions cannot be initiated on a port configured with SPAN or RSPAN.
•
Ethernet loopback is not supported on a range of dot1q tags.
•
Ethernet Data Plane Loopback is affected on STP enabled interface.
•
Dynamic addition of rewrite ingress tags with default EFP is not supported.
•
Dynamic changes at EFP and interface level are not supported when Ethernet Data Plane Loopback is
active.
•
Egress EFP is not updated for external Ethernet data plane loopback statistics.
•
For internal Ethernet data plane loopback ingress and egress interface statistics are not updated on
interface, where internal ELB is enabled.
RSP3 Module
•
Etype, VLAN, COS, src-mac, and llc-oui based loopback traffic filtering is
not
supported.
•
Port-based ELB is
not
supported.
•
Internal ELB is
not
supported when the physical interface port state is down.
•
Data filtering of loopback is
not
enforced for the traffic coming in the opposite direction.
•
Filtering based on specific VLAN is
not
supported.
•
Dot1Q filter is
not
supported.
•
Internal loopback sessions configured must be within the 100 GB reserved recycle bandwidth.
•
MAC-ACL
cannot
be bypassed in with facility loopback.
•
A maximum number of 20 facility loopback and 12 terminal loopback sessions are supported.
Information on Ethernet Data Plane Loopback
The Ethernet data plane loopback feature provides a means for remotely testing the throughput of an Ethernet
port. You can verify the maximum rate of frame transmission with no frame loss. This feature allows for
bidirectional or unidirectional throughput measurement, and on-demand/out-of-service (intrusive) operation
during service turn-up. This feature supports two types of Ethernet loopback.
Layer 2 Configuration Guide for Cisco NCS 4200 Series
2
Configuring Ethernet Dataplane Loopback
