Troubleshooting guide

11-42
ATM and Layer 3 Switch Router Troubleshooting Guide
OL-1969-01
Chapter 11 Troubleshooting Layer 3 Network Connections
Troubleshooting IPX Layer 3 Routing
Look at entry 2#. The word “dirty” in the display is a normal entry type. The prefix (IPX network
number) and node numbers are displayed. The entry marked “My-Node Valid” is for the directly
connected interface on Catalyst 8540-1. The other node entry, marked Valid, is for host A on the network.
Make a note of the hexadecimal address 0x101B (converted to decimal 4123). You need that hexadecimal
address, converted to decimal 4123, in Step 9.
Entries 3 and 4 are remote entries. NHOP1 means these are pointers to the adjacency entry for the next
hop to get to the IPX networks Prefix 0x8512 and Prefix 0x8511. These are not the MAC addresses of
the next hop. Valid means the entry is valid and usable.
Step 9 From the Catalyst 8540-1, use the show epc cam interface command with the CAM location
hexadecimal address 0x101B (converted to decimal 4123) and the CAM word 2 parameters to display
the status of the MAC rewrite for this interface.
C8540CSR-1# show epc cam interface gigabitEthernet 11/0/1 4123 2
.
(Information Deleted)
.
GigabitEthernet11/0/1 Addr:0x101B Word:2 Data[0]:0x009021DD Data[1]:0xDDDD0275
The ingress interface fields in the display indicate the MAC address is written to the following:
• 0x009021DD—the first four bytes of the next-hop MAC address
• 0xDDDD0275—the last two bytes of the next-hop MAC address
• 0xdddd0275—these last two bytes, in this example “0275,” translates to hexadecimal 0x27 == 39
(decimal), which matches the interface number 39 that appears in the show epc ifmapping
command mapped to the egress interface GigabitEthernet 11/0/1 in Step 7.
Step 10 From the Catalyst 8540-1, use the show epc if-entry interface command with the entry interface
parameters to display the status of the Broute VC.
C8540CSR-1# show epc if-entry interface gigabitEthernet 11/0/1 entry gigabitEthernet
10/0/0
IF Entry for GigabitEthernet10/0/0 on GigabitEthernet11/0/1
Mac(hex) - 00:90:21:CC:CC:CC
isMyInteface : False isSubInterface : False
Status Up Broute VC - 412 Bcast VC - 0
Netmask: 32
FEC disabled
Trunking Disabled
State : Not-Applicable/Listening/Blocking
Bridge-Group disabled
IP routing off bridging off
IPX routing on bridging off
Appletalk routing off
In Encapsulation: ET_SAP
ICMP Redirect enabled Unreachable enabled
IP Multicast disabled: ttl-threshold: 0
C8540CSR-1#
Step 11 Check the following:
• Status field to ensure that the Broute VC is up.
• IPX routing field to ensure that it is on.
• Encapsulation field to ensure that it is set to ET_SAP.