Troubleshooting guide

11-20
ATM and Layer 3 Switch Router Troubleshooting Guide
OL-1969-01
Chapter 11 Troubleshooting Layer 3 Network Connections
System Architecture
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slot: 2/* Controller-Type : ARM PAM
Part Number: 73-4208-01 Revision: 05
Serial Number: SCA03150016 Mfg Date: Apr 18 99
RMA Number: H/W Version: 1.0
FPGA Version: 2.3
EPIF Version: 1704 CAM size: 64 KB EPIF Version: 1704
CAM size: 64 KB
Ucode Version: 0.0 CAM Type: Dual
Port Phy Setup
Port 0: DONE GBIC Vendor: No vendor info.
Port 1: DONE GBIC Vendor: No vendor info.
slot: 3/* Controller-Type : ETHERNET PAM
Part Number: 73-3754-06 Revision: B0
Serial Number: CAB03282WBF Mfg Date: Jul 13 99
RMA Number: 0 H/W Version: 5.1
FPGA Version: 3.2
Chip 0 Reset Count: 0
Chip 1 Reset Count: 0
Chip 2 Reset Count: 0
Chip 3 Reset Count: 0
EPIF Version: 1704 CAM size: 16 KB
Ucode Version: 1.0 CAM Type: Private
--More--
In the previous example, the CAM Type field lists the CAM type for the ARM module in slot 2/* as Dual
and the CAM type for the Ethernet module in slot 3/* as Private.
Comparing Data Plane and Control Plane Traffic
Data plane traffic is traffic between two endpoints (for example, a host on subnet A communicating with
a host on subnet B). This data plane traffic will be typically switched by the Ethernet processor interface
or Gigabit processor interface. Control Plane traffic is traffic which is handled by the route processor,
typically Layer 2 and Layer 3 protocol updates.
The following is a list of traffic considered to be Control Plane traffic and handled by the route processor:
IP Packet Traffic on the Control Plane
IP packets are sent to the route processor in the following situations:
• Packets matching the switch router IP address
• No route found on the line card with “ICMP unreachable” is enabled
• Packets with TTL=0 after TTL decrement
• Packets with options set in IP header
• Packets in or out on the same interface and with ICMP redirect enabled
• ARP and Reverse ARP packets
• Certain multicast and broadcast packets (for example, OSFP/EIGRP route updates).
• RIP broadcasts