Interface-DLCI problem

[frosttear]

Hi all,

I've been doing some CCIE lab for my studying and when i get to establish a bgp with frame-relay i get an issue about interface-dlci.

Serial1/1 unassigned YES manual up up
Serial1/1.1 155.1.0.2 YES manual down down

R2#ping 155.1.0.2
****(Cant ping)
Type escape sequence to abort.
Sending 5, 100-byte ICMP Echos to 155.1.0.2, timeout is 2 seconds:
..
Success rate is 0 percent (0/2)
R2#conf
Configuring from terminal, memory, or network [terminal]?
Enter configuration commands, one per line. End with CNTL/Z.
R2(config)#inter
R2(config)#interface ser
R2(config)#interface serial 1/1.1 po
R2(config)#interface serial 1/1.1 point-to-point
R2(config-subif)#enca
R2(config-subif)#fra
R2(config-subif)#frame-relay inte
R2(config-subif)#frame-relay interface-dlci 205 *****(When i add interface-dlci, the interface is up and i can ping the interface????)
R2(config-fr-dlci)#
R2(config-fr-dlci)#end
R2#ping 155.1.0.2

Type escape sequence to abort.
Sending 5, 100-byte ICMP Echos to 155.1.0.2, timeout is 2 seconds:
!!
*Aug 22 00:05:08.679: %SYS-5-CONFIG_I: Configured from console by console!!!
Success rate is 100 percent (5/5), round-trip min/avg/max = 192/252/328 ms
R2#


!
interface Serial1/1
no ip address
encapsulation frame-relay
serial restart-delay 0
!
interface Serial1/1.1 point-to-point
ip address 155.1.0.2 255.255.255.0
frame-relay interface-dlci 205
!


R2#show frame-relay map (frame-relay interface-dlci 205 varken )
Serial1/1.1 (up): point-to-point dlci, dlci 205(0xCD,0x30D0), broadcast
status defined, active

****(But when i add the interface-dlci manualy there is no way that it learned with static or dynamic ?)


R2(config)#interface serial 1/1.1
R2(config-subif)#no frame-relay interface-dlci 205
R2(config-subif)#end
R2#show frame-relay map

****(I delete the command again with no frame-relay interface-dlci 205 )

-------------------2.Problem----------------------------------
R2#show ip inte
R2#show ip interface brief
Interface IP-Address OK? Method Status Protocol
Serial1/1 unassigned YES manual up up
Serial1/1.1 155.1.0.2 YES manual down down

****(and the interface is shutdown again)

R2(config)#interface serial 1/1.1
R2(config-subif)#no shut ****(when i command No shut, interface doesn't came up)
R2(config-subif)#do show ip interface brief
Serial1/1 unassigned YES manual up up
Serial1/1.1 155.1.0.2 YES manual down down

****(But when i add interface-dlci 205 command interface came up???)

R2(config-subif)#frame-relay interface-dlci 205
R2(config-fr-dlci)#do show ip interface brief
Serial1/1 unassigned YES manual up up
Serial1/1.1 155.1.0.2 YES manual up up

---------------------------------R5--------------------------------


interface Serial1/0
ip address 155.1.0.5 255.255.255.0
encapsulation frame-relay
serial restart-delay 0
!



R5#show frame-relay map
Serial1/0 (up): ip 155.1.0.2 dlci 502(0x1F6,0x7C60), dynamic,
broadcast,, status defined, active




****I dont need any interface-dlci command for R5, you can see my running-config part for R5. I Build in serial1/0 interface (not in point to point subinterface) and i can ping my R5 interface.

****But**** in R2, with this config;

!
interface serial 1/1
ip address 155.1.0.2 255.255.255.0
encapsulation frame-relay
!
interface serial 1/1.1
ip address 155.1.0.2 255.255.255.0
frame relay interface-dlci 205
!

***i can't ping my interface

***and after that i remove the ip address at the serial 1/1 and like that

!
interface serial 1/1
encapsulation frame-relay
!
interface serial 1/1.1
ip address 155.1.0.2 255.255.255.0
frame relay interface-dlci 205
!
***i can ping it well...? why its happening ? main interface dominate the subinterfaces and i cant ping it because the main hasnt got interface-dlci 205 command?

***my second question is:

!
interface serial 1/1.1 point-to-point
ip address 155.1.0.2 255.255.255.0
frame-relay interface-dlci 205
!
***i can ping the interface

***but

!
interface serial 1/1.1 point-to-point
ip address 155.1.0.2 255.255.255.0
!
***i cant ping the interface??? Why is that? is it happening because in subinterface there is no inverse-arp request?
but if it is like that why i didnt need in R5 (i mean i config it in main interface and no problem is happened)

Best Regards,
Mert OZKUL