Cisco WS-X6066-SLB-APC - Content Switching Module Software Manual page 226

Understanding How Layer 3 Switching Works
Because the FIB mirrors the unicast and multicast routing tables on the MSFC2, any commands on
Note
the MSFC2 that change the unicast or multicast routing tables affect the FIB. Forwarding entries
cannot be cleared from the Supervisor Engine 2 command-line interface (CLI).
In switches with redundant supervisor engines and MSFC2s, the designated MSFC2 supports the FIB on
the active Supervisor Engine 2. The routing protocols on the nondesignated MSFC2 send information to
the routing protocols on the designated MSFC2.
Enter the show mls entry cef command to display:
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Understanding the Adjacency Table
For each FIB entry, CEF for PFC2 stores Layer 2 information from the designated MSFC2 for adjacent
nodes in the adjacency table. Adjacent nodes are nodes that are directly connected at Layer 2. To forward
traffic, CEF for PFC2 selects a route from a FIB entry, which points to an adjacency entry, and uses the
Layer 2 header for the adjacent node in the adjacency table entry to rewrite the packet during Layer 3
switching. CEF for PFC2 supports 256K adjacency table entries.
Table 13-1
Table 13-1 Adjacency Types
Adjacency Type
connect
punt
no r/w
frc drp
drop, null, loopbk
Enter the show mls entry cef adjacency command to display:
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Catalyst 6000 Family Software Configuration Guide—Releases 6.3 and 6.4
13-6
Module number of the MSFC that is supporting the FIB
FIB entry type (receive, connected, resolved, drop, wildcard, or default)
Destination address (IP address or IPX network)
Destination mask
Next-hop address (IP address or IPX network)
Next-hop mask
Next-hop load-sharing weight
lists the adjacency types.
Description
Entry type that contains complete rewrite information
Entry to send traffic to the MSFC2
Entry to send traffic to the MSFC2 when rewrite information is incomplete
Entry used to drop packets due to ARP throttling
Entries used to drop packets
FIB information (see the "Understanding the FIB" section on page
Adjacency type (connect, drop, null, loopbk, frc drp, punt, no r/w)
Next-hop MAC address
Next-hop VLAN
Next-hop encapsulation
Number of packets transmitted to this adjacency from the associated FIB entry
Number of bytes transmitted to this adjacency from the associated FIB entry
Chapter 13 Configuring CEF for PFC2
13-5)
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