Specifications

Release Notes for Cisco IOS Release 12.0 S

78-7130-11 Rev. B0

New and Changed Information

Router-ports Group Management Protocol (RGMP)

Platforms: Cisco 7200 series, Cisco 7500/RSP series, Cisco 12000 series

Router-Port Group Management (RGMP) is a new protocol that restricts multicast traffic to router ports.

CGMP (Cisco Group Management Protocol) and IGMP (Internet Group Management Protocol) are two

existing features that restrict multicast traffic to hosts that do not need to receive them, reducing the

amount of processing the hosts have to do. CGMP and IGMP only restrict traffic on the ports of switches

to which hosts are connected. CGMP and IGMP are designed for typical access networks where many

hosts are connected but only one or two routers forward traffic to those hosts.

RGMP is designed for switched backbone networks or exchange points where predominantly routers

are connected to each other. Large amounts of multicast traffic can be restricted, eliminating

unnecessary congestion on the router ports. To effectively restrict multicast traffic to router ports, both

the routers and the switches on the network must support RGMP.

New Features in Cisco IOS Release 12.0(8)S

Many of the new features in Cisco IOS Release 12.0 S were originally introduced in other Cisco IOS

releases. For more complete information, refer to the original release.

APS Reflector Mode

Platforms: Cisco 12000 series

APS reflector mode enhances the operation of automatic protection switching (APS) by decreasing the

remote timeout that occurs when a remote router is informed of a switchover between the working

router and protect router in an APS circuit.

Cisco 12016 Gigabit Switch Router

Platforms: Cisco 12000 series

The Cisco 12016 Gigabit Switch Router (GSR), is a 16-slot member of the Cisco 12000 series of

Gigabit Switch Routers. The Cisco 12016 GSR delivers a raw transmission rate per slot of up to 10

Gbps, a switching capacity of up to 160 Gbps, and speeds of up to OC-48/STM-16 (2.44 Gbps). It uses

the same Gigabit Route Processor (GRP) and line cards (OC-3, OC-12, and OC-48) as the other routers

in the Cisco 12000 series of routers. See the following document for further information:

http://www.cisco.com/univercd/cc/td/doc/product/core/cis12016/hfricg/index.htm

Enhanced Quad OC-12c/STM-4c Layer 3 Packet-over-SONET Line Card

Platforms: Cisco 12000 series

The Quad OC-12c/STM-4c Packet-over-SONET (POS) line card provides Cisco 12000 series routers

with four 622-Mbps POS interfaces on a single card. The card interfaces with the switch fabric in the

Cisco 12000 series router and provides four OC-12c/STM-4c duplex SONET connections via

Single-Mode OC-3c Cable (SC Connectors). Each 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/core/cis12012/bfrcfig/10187pos.htm