1-100
Cisco uBR7200 Series Universal Broadband Router Software Configuration Guide
OL-2239-05
Chapter 1 Overview of Cisco uBR7200 Series Software
cops tcp window-size
when there were equal-cost paths between routers, IP multicast packets traversed only one path. If a
tunnel was configured, the same next hop was always used, and no load splitting occurred. IP multicast
load splitting is accomplished indirectly by consolidating the available bandwidth of all the physical
links into a single tunnel interface. The underlying physical connections then use existing unicast
load-splitting mechanisms for the tunnel (multicast) traffic.
Note
This feature is load splitting the traffic, not load balancing the traffic.
By configuring load splitting among equal-cost paths, you can use your links between routers more efficiently
when sending IP multicast traffic. For configuration information, refer to the following document on
Cisco.com:
•
“Configuring IP Multicast Routing”
chapter in the
Cisco IOS IP Configuration Guide
, Release 12.2
guide on Cisco.com:
http://www.cisco.com/en/US/docs/ios/12_2/ip/configuration/guide/fipr_c.html
IP Multicast over ATM Point-to-Multipoint Virtual Circuits
IP multicast over ATM point-to-multipoint virtual circuits is a feature that dynamically creates ATM
point-to-multipoint SVCs to handle IP multicast traffic more efficiently.
The feature can enhance router performance and link utilization because packets are not replicated and
sent multiple times over the ATM interface.
For configuration information, refer to the following document on Cisco.com:
•
“Configuring IP Multicast Routing”
chapter in the
Cisco IOS IP Configuration Guide
, Release 12.2
guide on Cisco.com:
http://www.cisco.com/en/US/docs/ios/12_2/ip/configuration/guide/fipr_c.html
IP Multicast over Token Ring LANs
By default, IP multicast datagrams on Token Ring LAN segments use the MAC-level broadcast address
0xFFFF.FFFF.FFFF. That default places an unnecessary burden on all devices that do not participate in
IP multicast. The IP multicast over Token Ring LANs feature defines a way to map IP multicast
addresses to a single Token Ring MAC address.
This feature defines the Token Ring functional address (0xc000.0004.0000) that should be used over
Token Ring. A functional address is a severely restricted form of multicast addressing implemented on
Token Ring interfaces. Only 31 functional addresses are available. A bit in the destination MAC address
designates it as a functional address.
The implementation used by Cisco complies with RFC 1469,
IP Multicast over Token-Ring Local Area
Networks
.
If you configure this feature, IP multicast transmissions over Token Ring interfaces are more efficient
than they formerly were. This feature reduces the load on other machines that do not participate in IP
multicast because they do not process these packets.
For configuration information, refer to the following document on Cisco.com:
•
“Configuring IP Multicast Routing”
chapter in the
Cisco IOS IP Configuration Guide
, Release 12.2
guide on Cisco.com:
http://www.cisco.com/en/US/docs/ios/12_2/ip/configuration/guide/fipr_c.html
