Cisco Systems 3750E manual 45-24

Chapter 45 Troubleshooting

Using the show platform forward Command

Gi1/0/1	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
Gi1/0/2	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

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 gigabitethernet1/0/1 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
Ingress:
Lookup		Key-Used			Index-Hit A-Data
InptACL 40_0D020202_0D010101-00_40000014_000A0000					01FFA	03000000
L2Local 80_00050009_43A80145-00_00000000_00000000					00086	02010197
Station Descriptor:F0050003, DestIndex:F005, RewriteIndex:0003
==========================================
Egress:Asic 3, 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
Gi1/0/2	0005	0001.0001.0001	0009.43A8.0145

This is an example of the output when the packet coming in on port 1 in VLAN 5 has a destination MAC address set to the router MAC address in VLAN 5 and the destination IP address unknown. Because there is no default route set, the packet should be dropped.

Switch# show platform forward gigabitethernet1/0/1 vlan 5 1.1.1 03.e319.ee44 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_41000014_000A0000		01FFA	03000000
L3Local 00_00000000_00000000-90_00001400_0D020202		010F0	01880290
L3Scndr	12_0D020202_0D010101-00_40000014_000A0000	034E0	000C001D_00000000

Lookup Used:Secondary

Station Descriptor:02260000, DestIndex:0226, RewriteIndex:0000

	Catalyst 3750-E and 3560-E Switch Software Configuration Guide
45-24	OL-9775-02