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Cisco Broadband Cable Command Reference Guide
OL-1581-07
Chapter 6 Cable CPE Commands
show dhcp
The following example shows typical output for the
show dhcp server
command:
Router#
show dhcp server
DHCP server: ANY (255.255.255.255)
Leases: 1
Offers: 1 Requests: 2 Acks: 1 Naks: 0
Declines: 0 Releases: 0 Bad: 0
TFTP Server Name: SOHOSERVER
TIME0: 1.2.0.250, TIME1: 0.0.0.0
Subnet: 255.255.255.0
Router#
Table 6-29
describes the fields shown in the display.
DHCP Lease server
IP address of the DHCP server that assigned an IP address to this client.
state
Current state of this client (the cable interface). Possible states are Bound,
Renew, or Rebinding. For descriptions of these states, see RFC 2131.
DHCP transaction id
Unique number established by the router before the first request message is
sent to the DHCP server. The same transaction ID is used as long as the
lease keeps getting renewed and is valid. If a new “discover” message is
sent, a new transaction ID is used.
Lease
Time (in seconds) for which the leased IP address is valid; the duration of
the lease.
Renewal
Time interval (in seconds) from address assignment until the client
transitions to the renewing state. When the renewal (T1) time expires, the
client sends a unicast dhcprequest message to the server to extends its lease.
The default value of this timer is 0.5 times the duration of the lease.
Rebind
Time interval (in seconds) from address assignment until the client
transitions to the rebinding state and sends a broadcast dhcprequest message
to any DHCP server to extends its lease. The default value of this timer (T2)
is 0.875 times the duration of the lease.
Temp default-gateway
addr
IP address of the router closest to this client on the network.
Next timer fires after
Time in hours, minutes, and seconds until the next timer expires.
Retry count
Number of times the client has sent any message to the DHCP server—most
likely a request message to extend its lease. When the lease is renewed, the
Retry count is reset to 0.
Client-ID
MAC address (with optional media type code) that uniquely identifies the
client on the subnet for binding lookups.
Table 6-28 show dhcp lease Field Descriptions (continued)
Field
Description
Table 6-29 show dhcp server Field Descriptions
Field
Description
DHCP server
MAC address used by the DHCP server.
Leases
Number of current leased IP addresses.
Offers
Number of offers for an IP address sent to a proxy client from the server.