interface loopback 0
 ip address 10.3.100.1 255.255.255.255
 ipv6 address 1234::10:3:100:1/128
 cdp enable
 no shutdown
interface serial 0
 description laba-s1
 ip address 10.3.1.1 255.255.255.252
 ipv6 address 1234::10:3:1:1/126
 clock rate 4000000
 cdp enable
 no shutdown
interface serial 1
 description labb-s0
 ip address 10.2.1.2 255.255.255.252
 ipv6 address 1234::10:2:1:2/126
 cdp enable
 no shutdown
interface ethernet 0
 description cata1-fe7
 ip address 10.3.3.1 255.255.255.0
 ipv6 address 1234::10:3:3:1/120
 cdp enable
 no shutdown