1054
Troubleshooting
Troubleshooting Examples
Troubleshooting Examples
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.
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 application-specific integrated circuits (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 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 GigabitEthernet1/17 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 Key-Used Index-Hit A-Data
InptACL 40_0D020202_0D010101-00_40000014_000A0000 01FFA 03000000
L2Local 80_00050002_00020002-00_00000000_00000000 00C71 0000002B
Station Descriptor:02340000, DestIndex:0239, RewriteIndex:F005
==========================================
Egress:Asic 2, switch 1
Output Packets:
------------------------------------------
Packet 1
Lookup Key-Used Index-Hit A-Data
OutptACL 50_0D020202_0D010101-00_40000014_000A0000 01FFE 03000000
Port Vlan SrcMac DstMac Cos Dscpv
Gi1/17 0005 0001.0001.0001 0002.0002.0002
------------------------------------------
Packet 2
Lookup Key-Used Index-Hit A-Data
OutptACL 50_0D020202_0D010101-00_40000014_000A0000 01FFE 03000000
Port Vlan SrcMac DstMac Cos Dscpv
Gi1/17 0005 0001.0001.0001 0002.0002.0002
------------------------------------------
<output truncated>
------------------------------------------
Packet 10
Lookup Key-Used Index-Hit A-Data
OutptACL 50_0D020202_0D010101-00_40000014_000A0000 01FFE 03000000
Packet dropped due to failed DEJA_VU Check on Gi1/0/2
Packet dropped due to failed DEJA_VU Check on Gi1/18
This is an example of the output when the packet coming in on port 1 in VLAN 5 is sent to an address already learned
on the VLAN on another port. It should be forwarded from the port on which the address was learned.
Switch# show platform forward GigabitEthernet1/17 vlan 5 1.1.1 0009.43a8.0145 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
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