show dhcp
Configuring the Cisco uBR900 Series Cable Access Routers 109
Following is sample output for the show dhcp server command:uBR924# 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
Table15 describes the significant fields shown in the display.Table14 show dhcp lease Field Descriptions
Field Description
Temp IP addr IP address leased from the DHCP server for the cable access router interface.
Temp subnet mask Temporary subnet mask assigned to the cable access router interface.
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 access router interface). Possible states are Bound,
Renew, or Rebinding. For descriptions of these states, see RFC 2131.
DHCP transaction id Unique number established by the Cisco uBR900 series 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.
Table15 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.
Requests Number of requests for an IP address to t he server.