Using The Show Platform Forward Command - Cisco ME 3400 Software Configuration Manual

Chapter 44 Troubleshooting
Be aware that the debugging destination you use affects system overhead. Logging messages to the
Note
console produces very high overhead, whereas logging messages to a virtual terminal produces less
overhead. Logging messages to a syslog server produces even less, and logging to an internal buffer
produces the least overhead of any method.
For more information about system message logging, see
Logging."

Using the show platform forward Command

The output from the show platform forward privileged EXEC command provides some useful
information about the forwarding results if a packet entering an interface is sent through the system.
Depending upon the parameters entered about the packet, the output provides lookup table results and
port maps used to calculate forwarding destinations, bitmaps, and egress information.
For more syntax and usage information for the show platform forward command, see the switch
Note
command reference for this release.
Most of the information in the output from the command is useful mainly for technical support
personnel, who have access to detailed information about the switch ASICs. However, packet forwarding
information can also be helpful in troubleshooting.
This is an example of the output from the show platform forward command on Gigabit Ethernet port 1
in VLAN 5 when the packet entering that port is addressed to unknown MAC addresses. The packet
should be flooded to all other ports in VLAN 5.
Switch# show platform forward gigabitethernet0/1 vlan 5 1.1.1 2.2.2 ip 13.1.1.1 13.2.2.2
udp 10 20
Global Port Number:24, Asic Number:5
Src Real Vlan Id:5, Mapped Vlan Id:5
Ingress:
Lookup
InptACL
L2Local
Station Descriptor:02340000, DestIndex:0239, RewriteIndex:F005
==========================================
Egress:Asic 2, switch 1
Output Packets:
------------------------------------------
Packet 1
Lookup
OutptACL 50_0D020202_0D010101-00_40000014_000A0000
Port
Gi0/1
------------------------------------------
Packet 2
Lookup
OutptACL 50_0D020202_0D010101-00_40000014_000A0000
Port
OL-9639-07
Key-Used
40_0D020202_0D010101-00_40000014_000A0000
80_00050002_00020002-00_00000000_00000000
Key-Used
Vlan SrcMac
0005 0001.0001.0001 0002.0002.0002
Key-Used
Vlan SrcMac
Cisco ME 3400 Ethernet Access Switch Software Configuration Guide
Using the show platform forward Command
Chapter 28, "Configuring System Message
Index-Hit
01FFA
00C71
Index-Hit
01FFE
DstMac Cos Dscpv
Index-Hit
01FFE
DstMac Cos Dscpv
A-Data
03000000
0000002B
A-Data
03000000
A-Data
03000000
44-19