TCP/IP Router Diagnostic Tools
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encapsulation type, and interface that it learned the MAC from. Here is a
sample:
Router_C#show ip arp
Protocol Address Age (min) Hardware Addr Type
Interface
Internet 172.16.60.1 - 0010.7bd9.2881 ARPA
Ethernet0/1
Internet 172.16.50.2 - 0010.7bd9.2880 ARPA
Ethernet0/0
Internet 172.16.50.1 6 0000.0c09.99cc ARPA
Ethernet0/0
Router_C#
debug Commands
Just as with the show commands, there are numerous debug commands and
options. The problem being analyzed will dictate which IP debug commands
need to be used. Table 6.1 lists most of the available debug commands and
options within IP. The first command, arp, is not an IP-specific command,
yet it provides valuable IP information.
T A B L E 6 . 1
IP debug Commands and Options
Command
Description
arp
IP ARP and HP Probe transactions
bgp
BGP information
cache
IP cache operations
cef
IP CEF operations
cgmp
CGMP protocol activity
drp
Director response protocol
dvrmp
DVMRP protocol activity
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