5
Cisco IOS XE 3S Release Notes for the Cisco ASR 903 Router
OL-26630-08
Chapter
New Software Features in Cisco IOS XE Release 3.10S
For more information, refer to the
IP Routing: BFD Configuration Guide, Cisco IOS XE Release 3S
(Cisco ASR 903)
,
IP Routing Protocol-Independent Commands A through R
, and
IP Routing
Protocol-Independent Commands S through T
.
Bidirectional Forwarding Detection Deterministic Hardware Offload
The Bidirectional Forwarding Detection (BFD) deterministic hardware offload feature allows you to
define the BFD transmission timer value. Any BFD sessions below or equal to the set value are sent to
hardware.
For more information see,
Bidirectional Forwarding Detection Deterministic Hardware Offload.
Broadcast and Multicast Suppression
A traffic storm occurs when packets flood the LAN, creating excessive traffic and degrading network
performance. The traffic broadcast and multicast suppression (or storm control) feature prevents LAN
ports from being disrupted by a broadcast, multicast and unicast traffic storm on physical interfaces.
Storm control prevents traffic on a LAN from being disrupted by a broadcast, multicast, or unicast storm
on a port. Storm control is applicable for physical interfaces and is used to restrict the unicast, broadcast
and multicast ingress traffic on the Layer2 interfaces. The feature is disabled by default on the Cisco
ASR 903 router.
For more information see,
Configuring Broadcast and Multicast Suppression on the Cisco ASR Router.
IGMP Snooping
IP Multicast Internet Group Management Protocol (IGMP), which runs at Layer 3 on a multicast device,
generates Layer 3 IGMP queries in subnets where the multicast traffic must be routed. IGMP (on a
device) sends out periodic general IGMP queries.
IGMP Snooping is an Ethernet Virtual Circuit (EVC)-based feature set. When IGMP snooping is enabled
on a bridge domain, the bridge domain interface responds at Layer 2 to the IGMP queries with only one
IGMP join request per Layer 2 multicast group. Each bridge domain represents a Layer 2 broadcast
domain.
For more information see,
Configuring IGMP Snooping on Cisco ASR 903 Router
.
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.