Cisco WS-C3550-12G Software Configuration Manual page 714
Multilayer switch
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Using the show forward Command
This is an example of the output from the show forward privileged EXEC command for Fast Ethernet
port 8, where VLAN ID, source and destination MAC addresses, and source and destination IP addresses
were provided.
Switch# show forward fa0/8 vlan 8 0000.1111.2222 0022.3355.9800 ip 8.8.8.10 4.4.4.33 255
signature:00000007, comparison ind:10, control info:2000941A control map:00000000
vlan:8, vlanid entry:000C0012 00000000 00000000 04620000
vlan:8, vlanid entry:000C0012 00000000 00000000 04620000
lookup
qos
acl
learn
forw
bridgeDestMap:
vlanMask:
portMask:
sourceMask:
globalMap:
globalMask:
forwMap:
frame notifies:
src u_dat vlan fl q-map
2
00
Egress q 8
signature:00000007, comparison ind:10, control info:2000941A control map:00000000
vlan:8, vlanid entry:000C0012 00000000 00000000 04620000
FastEthernet0/9 vlan 8, dst 0022.3355.9800 src 0000.1111.2222, cos 0x0, dscp 0x0
Much of this information is useful mainly for Technical Support personnel, who have access to detailed
information about the switch application-specific integrated circuits (ASICs). However, you can look at
the Egress q section to get information about the output interface. There is an egress section for each
separate destination port. The important information is in the line containing the name of the output
interface, output VLAN ID, and rewritten destination MAC address for the frame. The example shows
that the output interface is Fast Ethernet port 9 and the output VLAN is VLAN 8 and provides the
rewritten source and destination MAC address for the frame.
If the output interface is a trunk port that needs to transmit multiple copies of the frame on different
VLANs (for example, for IP multicast frames), several lines might contain the same output interface
name, but different output VLANs. If output security access control lists (ACLs) are present, it is
possible that one or more of these Egress q sections will not contain a line listing an output port. This
happens when the output ACL denies the packet.
When the CPU is one of the destinations for a packet, a Cpu q section is displayed, followed by a queue
name. This name should correspond to one of the queue names in the output from the show controllers
cpu-interface privileged EXEC command, where statistics are displayed for the number of packets
received at each queue.
This is an example of the Cpu q section display:
Cpu q:100 - routing queue
Catalyst 3550 Multilayer Switch Software Configuration Guide
27-16
key
940808080A04040421 800000000000FF0000 0
940808080A04040421 800000000000FF0000 1
187008000011112222 801008002233559800 0
187008000011112222 801008002233559800 1
00000000 00000000 0000FFFF FFFFFFC7
00000000 00000000 0000FFFF FFFFFE7F
00000000 00000000 00000000 00000080
00000000 00000000 00000000 00000000
00000000 00000000 00000000 00000000
00000000 00000000 0002FFFF EFFFFC03
00000000 00000000 00000000 00000100
8
00 00000000 00000000 00000000 00000100
Chapter 27
bk adata
rawoff secoff sec
00000000 006304 004064
00000082 045408 002016
80010003 002176 002176
40020000 043328 010560
Troubleshooting
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