Using The Show Platform Forward Command - Cisco Catalyst 2960 Software Configuration Manual

Using the show platform forward Command

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.
Note For more syntax and usage information for the show platform forward command, see the switch
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 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 gigabitethernet1/01/1 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
Gi1/0/1
------------------------------------------
Packet 2
Lookup
OutptACL 50_0D020202_0D010101-00_40000014_000A0000
Port
Gi1/0/2
------------------------------------------
<output truncated>
------------------------------------------
Packet 10
Lookup
OutptACL 50_0D020202_0D010101-00_40000014_000A0000
Packet dropped due to failed DEJA_VU Check on Gi1/0/2
Catalyst 2960 and 2960-S Switches Software Configuration Guide, Release 15.0(1)SE
39-22
Key-Used
40_0D020202_0D010101-00_40000014_000A0000
80_00050002_00020002-00_00000000_00000000
Key-Used
Vlan SrcMac
0005 0001.0001.0001
Key-Used
Vlan SrcMac
0005 0001.0001.0001
Key-Used
Index-Hit
Index-Hit
DstMac Cos Dscpv
0002.0002.0002
Index-Hit
DstMac Cos Dscpv
0002.0002.0002
Index-Hit
Chapter 39 Troubleshooting
A-Data
01FFA 03000000
00C71 0000002B
A-Data
01FFE 03000000
A-Data
01FFE 03000000
A-Data
01FFE 03000000
OL-26520-01