sh ip interface brief

[shivaram840]

Hi folks,

we have recently configured 3925 ISR router with T1 circuits. Everything is working normally

but when i give a command show ip interface brief 

i could found my serials interfaces are showing unset even after reboot the router 

Interface                      IP-Address        OK?         Method          Status                          Protocol

Embedded- /0            unassigned        YES          NVRAM     administratively down   down

GigabitEthernet0/0  10.210.23.129   YES           NVRAM          down                           down

GigabitEthernet0/1   10.210.23.129  YES           NVRAM             up                              up

GigabitEthernet0/2    unassigned       YES           NVRAM      administratively down down

Serial0/0/0:0              unassigned       YES            unset                 up                              up

Serial0/0/1:0              unassigned       YES            unset                 up                              up

Serial0/1/0:0              unassigned       YES            unset                 up                              up

Serial0/1/1:0              unassigned       YES             unset                up                              up

Multilink1                 10.10.10.1          YES             NVRAM             up                              up

please give me a clarify on this one ? is there any risk factor ?

any commands would i missed ?

Thanks,

Shiva

[Georg Pauwen]

Hello Shiva,

method 'unset' refers to the method the serial interfaces obtain an IP address. Since you have not configured anything, the method is 'unset'. If you would configure e.g. 'ip address dhcp' you would see 'DCHP' in the method field.

Here is an excerpt from Cisco doc:

The method field has the following possible values:

•RARP or SLARP—Reverse Address Resolution Protocol (RARP) or Serial Line Address Resolution Protocol (SLARP) request
•BOOTP—Bootstrap protocol
•TFTP—Configuration file obtained from TFTP server
•manual—Manually changed by CLI command
•NVRAM—Configuration file in NVRAM
•IPCP—ip address negotiated command
•DHCP—ip address dhcp command
•unassigned—No IP address
•unset—Unset
•other—Unknown

[shivaram840]

Hi gpauwen,

below results are from other router but we havent configured any ip addrress on serial interface but still it is showing method is NVRAM

what could the issue.

Interface                              IP-Address            OK?              Method                 Status                       Protocol

GigabitEthernet0/0         167.228.170.130 YES                 NVRAM                    up                             up

GigabitEthernet0/1         unassigned              YES              NVRAM         administratively down   down

Serial0/0/0:0                    unassigned              YES               NVRAM                     up                          up

Serial0/0/1:0                    unassigned              YES               NVRAM                      up                         up

Serial0/1/0:0                    unassigned              YES               NVRAM                       up                         up

Serial0/1/1:0                    unassigned              YES               NVRAM                       up                         up

Multilink1                         10.10.10.2                YES               NVRAM                      up                          up

Thanks,

Shiva