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Chapter 13
Configuring CEF for PFC2 and PFC3A
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Console> (enable) show mls entry cef
Mod FIB-Type
--- --------- --------------- ---------------- --------------- ------
15 receive
15 receive
15 receive
15 receive
15 receive
15 receive
15 receive
15 receive
15 receive
15 receive
.
.
.
Console> (enable)
Enter the show mls command to display a Layer 3 switching summary:
Console> (enable) show mls
Total packets switched = 35254
Total bytes switched = 2256256
Total routes = 120569
Total number of Netflow entries = 120000
IP statistics flows aging time = 50 seconds
Long-duration flows aging time = 320 seconds
IP statistics flows fast aging time = 0 seconds, packet threshold = 0
IP Current flow mask is Full-Vlan flow
Netflow Data Export version: 7
Netflow Data Export disabled
Netflow Data Export port/host is not configured.
Total packets exported = 0
Destination Ifindex export is enabled
Source Ifindex export is enabled
Rate limiting is turned off, packets are bridged to router
Load balancing hash is based on source and destination IP addresses and universc
Per-prefix Stats for ALL FIB entries is Enabled
Console> (enable)
Understanding the Adjacency Table
For each FIB entry, CEF for PFC2/PFC3A stores Layer 2 information from the designated
MSFC2/MSFC3 for adjacent nodes in the adjacency table. Adjacent nodes are nodes that are directly
connected at Layer 2. To forward traffic, CEF for PFC2/PFC3A 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 256,000 adjacency table
entries. CEF for PFC3A supports 1,000,000 adjacency table entries. Only half of the adjacency table entries
provide statistics.
OL-8978-04
Next-hop mask
Next-hop load-sharing weight
Destination-IP
0.0.0.0
255.255.255.255 255.255.255.255
127.0.0.0
127.0.0.52
127.255.255.255 255.255.255.255
10.1.1.2
10.1.1.0
10.1.1.255
10.10.1.1
10.10.0.0
Destination-Mask NextHop-IP
255.255.255.255
255.255.255.255
255.255.255.255
255.255.255.255
255.255.255.255
255.255.255.255
255.255.255.255
255.255.255.255
Catalyst 6500 Series Switch Software Configuration Guide—Release 8.7
Understanding How Layer 3 Switching Works
Weight
13-7
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