Specifications

39
Release Notes for Cisco IOS Release 12.0 S
78-7130-11 Rev. B0
New and Changed Information
Gigabit Ethernet Line Card
Platforms: Cisco 12000 series
The Gigabit Ethernet line card provides Cisco 12000 series routers with an optical Ethernet interface
on a single card that operates faster than 1 Gbps. The card interfaces with the switch fabric in the
Cisco 12000 series router and provides one Gigabit Ethernet SC single-mode or multimode connection.
This connection is concatenated, which provides for increased efficiency by eliminating the need to
partition the bandwidth. See the following document for further information:
http://www.cisco.com/univercd/cc/td/doc/product/software/ios112/ios112p/gsr/gigecr.htm
GRP Redundant Processor Support
Platforms: Cisco 12000 series
The Gigabit Route Processor (GRP) redundant processor feature allows for the installation of two GRPs
in a Cisco 12000 series Gigabit Switch Router. One GRP functions as the primary processor. The
primary GRP supports all normal GRP operation. The other GRP functions as the secondary processor.
The secondary GRP monitors the primary and will take over normal GRP operations if it detects a
failure in the primary GRP. See the following document for further information:
http://www.cisco.com/univercd/cc/td/doc/product/software/ios112/ios112p/gsr/gsr_rp.htm
ISL Support
Platforms: Cisco 7200 series, Cisco 7500/RSP series, Cisco 12000 series
Inter-Switch Link (ISL) support maintains virtual LAN (VLAN) information as traffic flows between
switches and routers. ISL support has been added to the following images for the Cisco 7000 family in
Release 12.0(5)S: c7200-p-mz, c7200-k3p-mz, c7200-k4p-mz, rsp-pv-mz, rsp-k3pv-mz and
rsp-k4pv-mz.
Multicast BGP
Platforms: Cisco 7200 series, Cisco 7500/RSP series, Cisco 12000 series
The Multicast Border Gateway Protocol (MBGP) feature adds capabilities to BGP to enable multicast
routing policy throughout the Internet and to connect multicast topologies within and between BGP
autonomous systems. That is, MBGP is an enhanced BGP that carries IP multicast routes. BGP carries
two sets of routes, one set for unicast routing and one set for multicast routing. The routes associated
with multicast routing are used by the Protocol Independent Multicast (PIM) to build data distribution
trees.
It is possible to configure BGP peers that exchange both unicast and multicast network-layer
reachability information (NLRI).
MBGP is useful when you want a link dedicated to multicast traffic, perhaps to limit which resources
are used for which traffic. Perhaps you want all multicast traffic exchanged at one network access point
(NAP). MBGP allows you to have a unicast routing topology different from a multicast routing
topology. Thus, you have more control over your network and resources.