Use the output from ethereal and the MAC forwarding tables to explain why some packets are looping indefinitely.
What will be an ideal response?
```
Router1#show bridge
Total of 300 station blocks, 298 free
Codes: P - permanent, S - self
Bridge Group 1:
Address Action Interface Age RX count TX count
0050.bf90.7d33 forward Ethernet0/0 0 6 37274
0004.75ad.04b8 forward Ethernet0/1 0 37276 6
Router2#show bridge
Total of 300 station blocks, 298 free
Codes: P - permanent, S - self
Bridge Group 1:
Address Action Interface Age RX count TX count
0050.bf90.7d33 forward Ethernet0/1 0 4 37282
0004.75ad.04b8 forward Ethernet0/0 0 1325033 76
Router3#show bridge
Total of 300 station blocks, 298 free
Codes: P - permanent, S - self
Bridge Group 1:
Address Action Interface Age RX count TX count
0050.bf90.7d33 forward Ethernet0/0 0 7 92
0004.75ad.04b8 forward Ethernet0/0 0 92 5
Router4#show bridge
Total of 300 station blocks, 298 free
Codes: P - permanent, S - self
Bridge Group 1:
Address Action Interface Age RX count TX count
0050.bf90.7d33 forward Ethernet0/1 0 5 97
0004.75ad.04b8 forward Ethernet0/1 0 1287824 75
```
Let portA be the port associated with ethernet0 of the bridges, and portB be the port associated with ethernet1.
```
Router1 Router 2 Router3 Router 4 PC2
portA portB portA portB portA portB portA portB portA PortB
PC1 PC4 PC1 PC1 PC4 PC1 PC4 PC4 PC1 PC4
```
The reply messages sent by PC4 to PC1 will follow the loop:
1. Router 3
2. Router 2
3. Router 4
4. … repeat of steps 1, 2, 3
Thus from the captured ethereal output we determine that the paths between PC1 and PC4 have loops and packets are looping indefinitely.
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