Cisco ASR 900 Series Release Notes

3
Cisco IOS XE 3S Release Notes for the Cisco ASR 903 Router
OL-26630-12
Chapter New Features in Cisco IOS XE 3.9S Releases
New Software Features in Cisco IOS XE Release 3.9(0)S
• DWDM-XFP-60.61
• DWDM-XFP-C
• DWDM-XFP-1560.61
New Software Features in Cisco IOS XE Release 3.9(0)S
Release 3.9(0) introduces support for the following software features:
• BFD Echo Mode Hardware Offloading—BFD echo mode detects forwarding path failures on the
remote system using echo packets; this release introduces support for hardware offloading of BFD
echo mode packets for up to 255 sessions. The minimum supported timer value for offloaded BFD
echo mode sessions is 3.3 ms. BFD echo offloading directs BFD echo packets to the high priority
queue instead of the default queue. For more information about how to configure BFD, see IP
Routing: BFD Configuration Guide, Cisco IOS XE Release 3S (Cisco ASR 903).
• BGP Support for 4-byte ASN —This release introduces support for 4-byte autonomous system
numbers in both the asplain format and the asdot format as described in RFC 5396. For more
information, see
http://www.cisco.com/en/US/docs/ios-xml/ios/iproute_bgp/configuration/xe-3s/asr903/irg-4byte-a
sn.html
• CFM Support for Trunk EFP—This release introduces support for CFM on trunk EFP interfaces.
For more information about configuring EFPs, see Configuring Ethernet Virtual Connections on the
Cisco ASR 903 Router. For more information about configuring CFM, see the Carrier Ethernet
Configuration Guide, Cisco IOS XE Release 3S (ASR 903).
• Enhanced Object Tracking—The Enhanced Object Tracking feature separates the tracking
mechanism from Hot Standby Router Protocol (HSRP) in order to create a separate standalone
tracking process. The tracking process is available to other IOS processes and allows tracking of
other objects in addition to the interface line-protocol state. For more information, see
http://www.cisco.com/en/US/docs/ios/ios_xe/ipapp/configuration/guide/ipapp_eot_xe.html.
• Embedded Event Manager (EEM) 4.0—Embedded Event Manager (EEM) is a distributed and
customized approach to event detection and recovery offered directly in a Cisco IOS device. EEM
offers the ability to monitor events and take informational, corrective, or any desired EEM action
when the monitored events occur or when a threshold is reached. For more information, see
http://www.cisco.com/en/US/docs/ios-xml/ios/eem/configuration/xe-3s/eem-overview.html.
• IP FRR/Remote LFA FRR with L2VPN—The Loop-Free Alternate (LFA) Fast Reroute (FRR) with
Layer 2 Virtual Private Network (L2VPN) feature minimizes packet loss due to link or node failure.
For more information, see
http://www.cisco.com/en/US/docs/ios-xml/ios/mp_l2_vpns/configuration/xe-3s/asr903/mp-l2vpn-l
fa-frr.html.
• IS-IS topology of 3000 nodes—This release extends IS-IS capacity to include support for 3000
nodes. For more information about configuring IS-IS routing, see IP Routing: Protocol-Independent
Configuration Guide, Cisco IOS XE Release 3S (Cisco ASR 903).
• ISO OSI Routing—This release introduces support for ISO OSI routing.
• Link Layer Discovery Protocol—Link Layer Discovery Protocol (LLDP) is defined in the IEEE
802.1ab standard and allows a non-Cisco device to interact with a Cisco device that uses Cisco
Discovery Protocol (CDP) for topology discovery. For more information, see
http://www.cisco.com/en/US/docs/ios-xml/ios/cether/configuration/xe-3s/asr903/ce-lldp-multiven
d.html.

Cisco ASR 900 Series Specifications

General

Brand	Cisco
Model	ASR 900 Series
Category	Network Router
Language	English