HI,

 attached are two running-config files for respecitve routers R5 and R6...
    R5 is configured with point to point sub-interface s0/1.1 which is pointing 
to R6 S0/1 without any point to point subinterface configured on R6. With 
current config I can't ping either way but when I am doing show frame-relay map 
on R-5 then I can see the static map to R-6 which is showing active state. But 
when I see the show frame-relay map on R6 then there is not entry there. 

    I found that communication starts in the below two scenarios:

    1) If I enable inverse-arp on R6 s0/1

    2) If I configure a point to point sub-interface on R6 with frame-relay 
interface-dlci command.



    My questions is why the subinterface is not communicating without giving 
inverse-arp or making a subinterface on r6.

    Regards

    MAK






!
version 12.3
service timestamps debug datetime msec
service timestamps log datetime msec
no service password-encryption
!
hostname R-5
!
boot-start-marker
boot system flash:c2600-j1s3-mz.123-24a.bin
boot-end-marker
!
!
no aaa new-model
ip subnet-zero
!
!
no ip domain lookup
!
ip cef
!
!
!
!
!
!
!
!
!
!
!
!
!
!
!
!
interface Ethernet0/0
 no ip address
 shutdown
 half-duplex
!
interface Serial0/0
 no ip address
 shutdown
 clock rate 56000
 no fair-queue
!
interface Ethernet0/1
 ip address 192.168.1.5 255.255.255.0
 half-duplex
!
interface Serial0/1
 no ip address
 encapsulation frame-relay
!
interface Serial0/1.1 point-to-point
 ip address 10.1.1.1 255.255.255.0
 no arp frame-relay
 frame-relay interface-dlci 506   
!
ip http server
ip classless
!
!
!
!
!
!
!
!
line con 0
 exec-timeout 0 0
 logging synchronous
line aux 0
line vty 0 4
 password cisco
 login
!
!
end
!
version 12.3
service timestamps debug datetime msec
service timestamps log datetime msec
no service password-encryption
!
hostname R-6
!
boot-start-marker
boot system flash:c2600-j1s3-mz.123-24a.bin
boot-end-marker
!
!
no aaa new-model
ip subnet-zero
!
!
no ip domain lookup
!
ip cef
!
!
!
!
!
!
!
!
!
!
!
!
!
!
!
!
interface Ethernet0/0
 no ip address
 shutdown
 half-duplex
!
interface Serial0/0
 no ip address
 shutdown
!
interface Ethernet0/1
 ip address 192.168.1.6 255.255.255.0
 half-duplex
!
interface Serial0/1
 ip address 10.1.1.2 255.255.255.0
 encapsulation frame-relay
 no arp frame-relay
 frame-relay interface-dlci 605
 no frame-relay inverse-arp
!
interface ATM1/0
 no ip address
 shutdown
 no atm ilmi-keepalive
!
router rip
 network 10.0.0.0
!
no ip http server
ip classless
!
!
!
!
!
!
!
!
line con 0
 exec-timeout 0 0
 logging synchronous
line aux 0
line vty 0 4
 password cisco
 login
!
!
end

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