interface loopback 0
 ip address 10.1.100.1 255.255.255.255
 ipv6 address 1234::10:1:100:1/128
 cdp enable
 no shutdown
interface serial 0
 description labb-s1
 ip address 10.1.1.1 255.255.255.252
 ipv6 address 1234::10:1:1:1/126
 clock rate 4000000
 cdp enable
 no shutdown
interface serial 1
 description labc-s0
 ip address 10.3.1.2 255.255.255.252
 ipv6 address 1234::10:3:1:2/126
 cdp enable
 no shutdown
interface ethernet 0
 description cata1-fe4 (labg-e0)
 ip address 10.1.3.1 255.255.255.0
 ipv6 address 1234::10:1:3:1/120
 cdp enable
 no shutdown
interface ethernet 1
 description cata1-fe5 (labd-e0)
 ip address 10.4.3.2 255.255.255.0
 ipv6 address 1234::10:4:3:2/120
 cdp enable
 no shutdown