MANAGING CISCO DHCP CLIENT IDENTIFIER

In scenarios where Internet access is provided by cable providers or local vendors, generally the Post to Post Links II error: Unrecognized type: ”slug” assigned to Cisco CPE at home is via Post to Post Links II error: Unrecognized type: ”slug”. By default Cisco Router is assigned IP address by DHCP on its Client ID.The Client ID has the format of “Cisco-Post to Post Links II error: Unrecognized type: ”slug””. However, this becomes a cumbersome job at times for Internet provider and customer to manage Client ID or perform troubleshooting on the same. Cisco has devised a solution to this problem. It has provision to replace Client ID with Post to Post Links II error: Unrecognized type: ”slug”of Post to Post Links II error: Unrecognized type: ”slug” Client. Now let’s see how this can be done –

1st, we see the mac address of Post to Post Links II error: Unrecognized type: ”slug” Client(Cisco Router at Customer end) –

R1#show interface fa0/0 | incl biaHardware is Gt96k FE, address is c200.10fc.0000 (bia c200.10fc.0000) 

Now , we enable DHCP debugging on Cisco Router to view how Post to Post Links II error: Unrecognized type: ”slug” communication between Client and server happens –

R1#debug dhcp detail

Next , configure Client Router Interface Fa0/0 to get Post to Post Links II error: Unrecognized type: ”slug” through DHCP –

R1(config)#int fa0/0R1(config-if)#ip address dhcp

Debug displays below output –

*Mar  1 00:23:04.515:    DHCP Lease server: 192.168.12.2, state: 2 Requesting*Mar  1 00:23:04.519:    DHCP transaction id: 19D7

*Mar  1 00:23:04.519:    Lease: 86400 secs,  Renewal: 0 secs,  Rebind: 0 secs

*Mar  1 00:23:04.519:    Next timer fires after: 00:00:03

*Mar  1 00:23:04.519:    Retry count: 1   Client-ID: cisco-c200.10fc.0000-Fa0/0

*Mar  1 00:23:04.519:    Client-ID hex dump: 636973636F2D633230302E313066632E

*Mar  1 00:23:04.523:    303030302D4661302F30

As shown above , Client ID of Cisco Router is cisco-c200.10fc.0000-Fa0/0.

Now configure Router to use mac address as the Clinet ID –

R1(config-if)#ip address dhcp client-id FastEthernet 0/0

*Mar  1 00:24:58.699:    DHCP Lease server: 192.168.12.2, state: 2 Requesting*Mar  1 00:24:58.699:    DHCP transaction id: 1EFF

*Mar  1 00:24:58.703:    Lease: 86400 secs,  Renewal: 0 secs,  Rebind: 0 secs

*Mar  1 00:24:58.703:    Next timer fires after: 00:00:03

*Mar  1 00:24:58.703:    Retry count: 1   Client-ID: c200.10fc.0000

*Mar  1 00:24:58.703:    Client-ID hex dump: C20010FC0000

*Mar  1 00:24:58.707:    Hostname: R1

*Mar  1 00:24:58.707: DHCP: SRequest- Server ID option: 192.168.12.2

*Mar  1 00:24:58.707: DHCP: SRequest- Requested IP addr option: 192.168.12.8

 

Now we can see Cisco Router has been assigned Post to Post Links II error: Unrecognized type: ”slug” with Post to Post Links II error: Unrecognized type: ”slug” as Client ID.

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