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6
Cisco IOS XE 3S Release Notes for the Cisco ASR 903 Router
OL-26630-12
Chapter
New Software Features in Cisco IOS XE Release 3.10S
Licensing the OC-3 and OC-12 Interface Modules
The optical modules 4-Port OC3/STM-1 or 1-Port OC12/STM-4 delivers four active ports of OC-3
interface module (IM) or Synchronous Transport Module level 1 (STM-1) connectivity, or one active
port of OC-12 IM or STM-4 connectivity, on the Cisco ASR 903 Router. Licensing is applicable to these
ports on the interface modules.
The benefits of licensing these ports are:
• Facilitate the pay-as-you-grow model to enhance the ports by purchasing licenses as required.
•
Provide the ability to shift license from one port to another.
•
Provide the ability to release a license when the interface module is removed from a slot and reinstall
the license when inserted again.
•
Support for high availability and OIR of interface modules.
Table 6-1 lists the license supported on the OC-3 and OC-12 interface modules.
For more information see, Licensing the OC-3 and OC-12 Interface Modules on the Cisco ASR 903
Router .
Multichassis LACP
Cisco's Multichassis EtherChannel (MCEC) solution addresses the need for interchassis redundancy
mechanisms, where a carrier wants to "dual home" a device to two upstream points of attachment (PoAs)
for redundancy. Some carriers either cannot or will not run loop prevention control protocols in their
access networks, making an alternative redundancy scheme necessary. MCEC addresses this issue with
enhancements to the 802.3ad Link Aggregation Control Protocol (LACP) implementation. These
enhancements are provided in the Multichassis LACP (mLACP) feature.
For more information, see Multichassis LACP .
Pseudowire Group Switchover
Currently, pseudowire switchovers to the backup pseudowires occur one by one from IOS to platform
dataplane and can take up to four seconds for 1000 pseudowires. The group switchover feature reduces
this switchover time by efficiently grouping status messages in both Label Distribution Protocol (LDP)
and internal Inter-Process Communications (IPCs).
Note The Pseudowire Group Switchover feature is enabled by default and cannot be disabled.
For more information, see Cisco ASR 903 Router Chassis Software Configuration Guide, IOS XE
Release 3.10S .
Table 6-1 OC-3 and OC-12 Port Licenses
License Type Description Usability
1 OC3 port license Single OC3/STM-1 port STM-1 on OC-3 port
1 OC12 port license Single OC12/STM-4
port STM-1 on OC-3 port