Monitoring And Maintaining The Ip Network; Understanding Ip Multicast Routing - Cisco ONS 15454 SDH Configuration Manual

Chapter 11 Configuring Networking Protocols
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Monitoring and Maintaining the IP Network

You can remove all contents of a particular cache, table, or database. You can also display specific
statistics. Use the privileged EXEC commands in
Table 11-9
Command
Router# clear ip route {network [ mask |
*]}
Router# show ip protocols
Router# show ip route [{ address [ mask ]
[longer-prefixes] | [ protocol
[ process-id ]}]
Router# show ip interface interface
Router# show ip interface brief
Router# show ip route summary
Router# show ip route supernets-only
Router# show ip cache
Router# show route-map [ map-name ]

Understanding IP Multicast Routing

As networks increase in size, multicast routing becomes critically important as a means to determine
which segments require multicast traffic and which do not. IP multicasting allows IP traffic to be
propagated from one source to a number of destinations, or from many sources to many destinations.
Rather than sending one packet to each destination, one packet is sent to the multicast group identified
by a single IP destination group address.
A principal component of IP multicasting is the Internet Group Management Protocol (IGMP). Hosts
identify their multicast group membership by sending IGMP messages to the ML-Series card. Traffic is
sent to all members of a multicast group. A host can be a member of more than one group at a time. In
addition, a host does not need to be a member of a group to send data to that group. When you enable
Protocol Independent Multicast (PIM) on an interface, you will have enabled IGMP operation on that
same interface.
The ML-Series cards support the protocol independent multicast (PIM) routing protocol and the
Auto-RP configuration.
PIM includes three different modes of behavior for dense and sparse traffic environments. These are
referred to as dense mode, sparse mode, and sparse-dense mode.
192.168.2.0/24 is directly connected, POS0
192.168.3.0/24 is directly connected, FastEthernet0
0.0.0.0/0 [1/0] via 192.168.2.1
Commands to Clear IP Routes or Display Route Status
Cisco ONS 15454 and Cisco ONS 15454 SDH Ethernet Card Software Feature and Configuration Guide, R8.0
Monitoring and Maintaining the IP Network
Table 11-9 to clear routes or display status.
Purpose
Clears one or more routes from the IP routing table.
Displays the parameters and state of the active routing
protocol process.
Displays the current state of the routing table.
Displays detailed information about the interface.
Displays summary status information about all
interfaces.
Displays the current state of the routing table in
summary form.
Displays supernets.
Displays the routing table used to switch IP traffic.
Displays all route maps configured or only the one
specified.
11-33