grep -B 1 -i "Northbound to" file1 > file2
grep -B 1 -i "Southbound to" file1 >> file2

##</code><code>##

grep: illegal option -- B
Usage: grep -hblcnsviw pattern file . . .
grep: illegal option -- B
Usage: grep -hblcnsviw pattern file . . .

##</code><code>##

interface POS2/1
 bandwidth 155520
 no ip address
 no ip directed-broadcast
 no ip proxy-arp
 load-interval 30
 shutdown
 crc 16
!
interface POS2/2
 description PL000000/00000000-O, NNI southbound To Somewhere fms 11111111
 no ip address
 no ip directed-broadcast
 no ip proxy-arp
 encapsulation frame-relay IETF
 no ip mroute-cache
 crc 16
 frame-relay lmi-type cisco
!
interface POS2/2.30 point-to-point
 description POS2/2.30 fr dlci=30. By VPNSC: Job Id# = 9999
 ip vrf forwarding V1234:Customer
 ip address 192.168.254.2 255.255.255.252
 no ip directed-broadcast
 snmp trap link-status
 no cdp enable
 frame-relay interface-dlci 30 IETF