Cisco 15327 - Manual (Page 191)

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Ethernet Card Software Feature and Configuration Guide, R7.2
Chapter 11 Configuring Networking Protocols
Monitoring and Maintaining the IP Network
C 192.168.2.0/24 is directly connected, POS0
C 192.168.3.0/24 is directly connected, FastEthernet0
S* 0.0.0.0/0 [1/0] via 192.168.2.1
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 to clear routes or display status.
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.
Table 11-9 Commands to Clear IP Routes or Display Route Status
Command Purpose
Router# clear ip route {network [ mask |
* ]}
Clears one or more routes from the IP routing table.
Router# show ip protocols Displays the parameters and state of the active routing
protocol process.
Router# show ip route [{ address [mask]
[longer-prefixes] | [ protocol
[ process-id]}]
Displays the current state of the routing table.
Router# show ip interface interface Displays detailed information about the interface.
Router# show ip interface brief Displays summary status information about all
interfaces.
Router# show ip route summary Displays the current state of the routing table in
summary form.
Router# show ip route supernets-only Displays supernets.
Router# show ip cache Displays the routing table used to switch IP traffic.
Router# show route-map [ map-name] Displays all route maps configured or only the one
specified.