Technical Documentation
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Monitoring DHCP Binding Host Information
Purpose
Display information for specified DHCP client bindings, with results arranged in ascending order by IP address. The show dhcp host command displays information only for DHCP client bindings with assigned IP addresses.
Action
To display information about all DHCP local server bindings:
host1:vr1#show dhcp host local BindingId HwAddress Type IpSubnet IpAddress State ---------- -------------- ----- -------- --------- ----- 2409734593 8000.0001.9365 local 0.0.0.0 81.3.0.2 bound 2409734595 8000.0003.9365 local 0.0.0.0 81.3.0.3 bound 2409734597 8000.0005.9365 local 0.0.0.0 81.3.0.4 bound 2409734599 8000.0007.9365 local 0.0.0.0 81.3.0.5 bound 2409734619 8000.0009.9365 local 0.0.0.0 81.3.0.6 bound 2409734618 8000.000b.9365 local 0.0.0.0 81.3.0.7 bound 2409734605 8000.000d.9365 local 0.0.0.0 81.3.0.8 bound 2409734607 8000.000f.9365 local 0.0.0.0 81.3.0.9 bound 2409734609 8000.0011.9365 local 0.0.0.0 81.3.0.10 bound 2409734611 8000.0013.9365 local 0.0.0.0 81.3.0.11 bound
The output of the show dhcp host command is identical to the output of the show dhcp binding command except for the order of the client bindings. The results of the show dhcp host command are arranged in ascending order by IP address, whereas the results of the show dhcp binding command are arranged in ascending order by binding ID.
To display binding information for DHCP clients with a specified interface string:
host1:vr2#show dhcp host interface ip71.*4 BindingId HwAddress Type IpSubnet IpAddress State ---------- -------------- -------- -------- --------- ----- 3053453315 7000.0002.9365 external 0.0.0.0 71.1.0.4 bound 3053453325 7000.000c.9365 external 0.0.0.0 71.1.0.14 bound 3053453353 7000.0016.9365 external 0.0.0.0 71.1.0.24 bound
This show dhcp host command uses the * (asterisk) regular expression metacharacter in the interface string to display information for DHCP client bindings on virtual router vr2 with an IP address beginning with 71 and ending with 4. The results of the show dhcp host command are arranged in ascending order by IP address.
To display binding information for DHCP clients that match the specified circuit ID string:
host1:vr3#show dhcp host circuit-id \\xe3 BindingId HwAddress Type IpSubnet IpAddress State ---------- -------------- ------- -------- --------- ----- 3070230529 7000.0000.9365 relay-p 0.0.0.0 71.1.0.2 bound 3070230531 7000.0002.9365 relay-p 0.0.0.0 71.1.0.4 bound 3070230572 7000.0004.9365 relay-p 0.0.0.0 71.1.0.6 bound 3070230535 7000.0006.9365 relay-p 0.0.0.0 71.1.0.8 bound 3070230537 7000.0008.9365 relay-p 0.0.0.0 71.1.0.10 bound 3070230539 7000.000a.9365 relay-p 0.0.0.0 71.1.0.12 bound 3070230541 7000.000c.9365 relay-p 0.0.0.0 71.1.0.14 bound 3070230543 7000.000e.9365 relay-p 0.0.0.0 71.1.0.16 bound 3070230545 7000.0010.9365 relay-p 0.0.0.0 71.1.0.18 bound 3070230547 7000.0012.9365 relay-p 0.0.0.0 71.1.0.20 bound 3070230549 7000.0014.9365 relay-p 0.0.0.0 71.1.0.22 bound 3070230569 7000.0016.9365 relay-p 0.0.0.0 71.1.0.24 bound 3070230553 7000.0018.9365 relay-p 0.0.0.0 71.1.0.26 bound 3070230555 7000.001a.9365 relay-p 0.0.0.0 71.1.0.28 bound 3070230557 7000.001c.9365 relay-p 0.0.0.0 71.1.0.30 bound
To specify nonprintable byte codes in the circuit ID string or remote ID string, you can use the string \\xab, where ab is a hex code of the byte. This show dhcp host command uses the string \\xe3 to represent byte E3 in the circuit ID string. This command displays information for the DHCP client bindings on virtual router vr3 with the specified circuit ID string, with results arranged in ascending order by IP address.
To display information about DHCP external server bindings with a specified subnet address:
host1:vr1#show dhcp host external 0.0.0.0
To display information about DHCP bindings with a specified IP prefix:
host1:vr1#show dhcp host ip—prefix 10.2.0.0/28
To display information about DHCP relay proxy bindings without a lower-layer interface:
host1:vr1#show dhcp host relay—proxy no-interface
To display binding information for DHCP clients that match the specified remote ID string:
host1:vr1#show dhcp host remote-id “remote id.*west”
Filtering the display of DHCP client bindings by the circuit ID string or remote ID string is not supported for the DHCP external server application. DHCP external server does not store information about the agent-circuit-id suboption or agent-remote-id suboption of option 82.
Meaning
Table 1 lists the show dhcp host command output fields.
Table 1: show dhcp host Output Fields
Field Name | Field Description |
|---|---|
BindingId | Client binding ID |
HwAddress | MAC address of client |
Type | Binding type; external (DHCP external server), local (DHCP local server), or relay-p (DHCP relay proxy) |
IpSubnet | For DHCP local server bindings, the subnet of the IP address assigned to the client; 0.0.0.0 for DHCP external server and DHCP relay proxy bindings |
IpAddress | IP address assigned to client |
State | State of the DHCP client binding |
Server | (Detailed output only) IP address of the DHCP server that allocated the client IP address |
Giaddr | (Detailed output only) For DHCP relay proxy the IP address of the DHCP relay proxy; for DHCP local server bindings, the IP address of the DHCP relay that sent the packet or 0.0.0.0 if the packet comes from the client; for DHCP external server bindings, the giaddr from the DHCP packet |
Lease | (Detailed output only) Total time for which the IP address is available, in seconds |
Remaining | (Detailed output only) Time remaining on the current lease, in seconds |
IpInterface | (Detailed output only) IP interface that is associated with the client |
