Cisco Cisco IOS Software Release 12.0 S
112
Cross-Platform Release Notes for Cisco IOS Release 12.0S
OL-1617-14 Rev. Q0
New and Changed Information
New Software Features in Cisco IOS Release 12.0(26)S
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Multicast Routing Information Base (MRIB)—The MRIB is a protocol-independent repository of
multicast routing entries instantiated by multicast routing protocols (routing clients). Its main
function is to provide independence between routing protocols and the Multicast Forwarding
Information Base (MFIB).
multicast routing entries instantiated by multicast routing protocols (routing clients). Its main
function is to provide independence between routing protocols and the Multicast Forwarding
Information Base (MFIB).
•
IPv6 multicast process switching and fast switching—In process switching, the Route Processor
must examine, rewrite, and forward each packet. IPv6 multicast fast switching stores information in
several data structures instead of in a route cache for efficient packet forwarding performance in
IPv6 multicast switching.
must examine, rewrite, and forward each packet. IPv6 multicast fast switching stores information in
several data structures instead of in a route cache for efficient packet forwarding performance in
IPv6 multicast switching.
•
IPv6 static multicast routes (mroutes) for IPv6—IPv6 static mroutes share the same database as IPv6
static routes and are implemented by extending static route support.
static routes and are implemented by extending static route support.
•
IPv6 multicast address family support for multiprotocol Border Gateway Protocol (BGP)—The
multiprotocol BGP for the IPv6 multicast address family feature provides multicast BGP (MBGP)
extensions for IPv6 and supports the same features and functionality as IPv4 BGP. IPv6
enhancements to MBGP include support for an IPv6 multicast address family and network layer
reachability information (NLRI) and next hop (the next router in the path to the destination)
attributes that use IPv6 addresses.
multiprotocol BGP for the IPv6 multicast address family feature provides multicast BGP (MBGP)
extensions for IPv6 and supports the same features and functionality as IPv4 BGP. IPv6
enhancements to MBGP include support for an IPv6 multicast address family and network layer
reachability information (NLRI) and next hop (the next router in the path to the destination)
attributes that use IPv6 addresses.
•
Reverse Path Forwarding (RPF) flooding of bootstrap router (BSR) packets—Cisco IOS IPv6
routers provide support for the RPF flooding of BSR packets so that a Cisco IOS IPv6 router will
not disrupt the flow of bootstrap messages (BSMs).
routers provide support for the RPF flooding of BSR packets so that a Cisco IOS IPv6 router will
not disrupt the flow of bootstrap messages (BSMs).
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IPv6 Protocol Independent Multicast (PIM) accept register—IPv6 multicast supports PIM-SM
register message filtering at the RP. The user can match an access list or compare the autonomous
system (AS) path for the registered source with the AS path specified in a route map.
register message filtering at the RP. The user can match an access list or compare the autonomous
system (AS) path for the registered source with the AS path specified in a route map.
•
Routable address hello option—When an IPv6 interior gateway protocol is used to build the unicast
routing table, the procedure to detect the upstream router address assumes the address of a PIM
neighbor is always same as the address of the next-hop router, as long as they see the same router.
However, it may not be the case when a router has multiple addresses on a link. The routable address
hello option allows the PIM protocol avoid such situation by adding a PIM hello message option that
includes all the addresses on the interface on which the PIM hello message is advertised.
routing table, the procedure to detect the upstream router address assumes the address of a PIM
neighbor is always same as the address of the next-hop router, as long as they see the same router.
However, it may not be the case when a router has multiple addresses on a link. The routable address
hello option allows the PIM protocol avoid such situation by adding a PIM hello message option that
includes all the addresses on the interface on which the PIM hello message is advertised.
For additional information, see the following document:
IPv6 Multicast on Cisco 12000 Series Line Cards
In Cisco IOS Release 12.0(26)S, IPv6 multicast is supported on the Cisco 12000 series on the following
line cards:
line cards:
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IP Services Engine (ISE) line cards:
–
4-port Gigabit Ethernet ISE
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4-port OC-3c/STM-1c POS/SDH ISE
–
8-port OC-3c/STM-1c POS/SDH ISE
–
16-port OC-3c/STM-1c POS/SDH ISE
–
4-port OC-12c/STM-4c POS/SDH ISE
–
1-port OC-48c/STM-16c POS/SDH ISE
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Engine 4 Plus (E4+) Packet-over-SONET (POS) line cards:
–
4-port OC-48c/STM-16c POS/SDH
–
1-port OC-192c/STM-64c POS/SDH