Interface configuration

Cisco


Interface (fa0/0 or s0/0/0 etc… …>)

Description (describe link) =>useful for troubleshooting as it can tell you where is it connected to

Ip address (ip address) (subnet mask)

No shut

hint: subnet mask

/32 255.255.255.255 no useful IP address

/31 255.255.255.254 no useful IP address

/30 255.255.255.252 useful for WAN link, 4 IPs (1 network, 1 broadcast, 2 user IPs)

/29 255.255.255.248 8 IPs (1 network, 1 broadcast, 6 user IPs)

/28 255.255.255.240 16 IPs (1 network, 1 broadcast, 14 user IPs)

/27 255.255.255.224 32 IPs (1 network, 1 broadcast, 30 user IPs)

/26 255.255.255.192 64 IPs (1 network, 1 broadcast, 62 user IPs)

/25 255.255.255.128 128 IPs (1 network, 1 broadcast, 126 user IPs)

/24 255.255.255.0

/23 255.255.254.0

/22 255.255.252.0

/21 255.255.248.0

/20 255.255.240.0


Juniper
Interface (fxp0,lo0,em0,fe-x/0/y,se-x/0/y)
x = PIM slot
y = Port Number


inet => IPv4


root@router#set interfaces em0 unit 0 family inet address (ip address)/(prefix)
root@router#commit


IPv6
Cisco - ipv6 address 2001:db8::1/64
Juniper - set interfaces em0 unit 0 family inet6 address 2001:200:30:2::1/64