interface GigabitEthernet1/4
 switchport trunk encapsulation dot1q
 switchport trunk native vlan 1508
 switchport trunk allowed vlan 1500-1599
 switchport mode trunk

interface Vlan1508
 description TO_BT_LAB_HOLLYWOOD
 ip address 100.15.242.9 255.255.255.248
 ip pim sparse-dense-mode
 ip ospf message-digest-key 1 md5 7 03266F342A2E03