Re: /31 mask

i would say YES it works for me...

Router#sh run int s0/0.1
Building configuration...

Current configuration : 138 bytes
!
interface Serial0/0.1 point-to-point
 ip address 1.1.1.0 255.255.255.254
 snmp trap link-status
 frame-relay interface-dlci 101
end
Router#ping 1.1.1.1

Router#sh ip route
Codes: C - connected, S - static, R - RIP, M - mobile, B - BGP
       D - EIGRP, EX - EIGRP external, O - OSPF, IA - OSPF inter area
       N1 - OSPF NSSA external type 1, N2 - OSPF NSSA external type 2
       E1 - OSPF external type 1, E2 - OSPF external type 2
       i - IS-IS, su - IS-IS summary, L1 - IS-IS level-1, L2 - IS-IS level-2
       ia - IS-IS inter area, * - candidate default, U - per-user static
route
       o - ODR, P - periodic downloaded static route

Gateway of last resort is not set

     1.0.0.0/31 is subnetted, 1 subnets
C 1.1.1.0 is directly connected, Serial0/0.1

Type escape sequence to abort.
Sending 5, 100-byte ICMP Echos to 1.1.1.1, timeout is 2 seconds:
!!!!!
Success rate is 100 percent (5/5), round-trip min/avg/max = 12/52/92 ms

R5(config-subif)#do sh run int s0/0.1
Building configuration...

Current configuration : 138 bytes
!
interface Serial0/0.1 point-to-point
 ip address 1.1.1.1 255.255.255.254
 snmp trap link-status
 frame-relay interface-dlci 202
end
R5(config-subif)#do ping 1.1.1.0

Type escape sequence to abort.
Sending 5, 100-byte ICMP Echos to 1.1.1.0, timeout is 2 seconds:
!!!!!
Success rate is 100 percent (5/5), round-trip min/avg/max = 1/42/104 ms

R5(config-subif)#do sh ip route
Codes: C - connected, S - static, R - RIP, M - mobile, B - BGP
       D - EIGRP, EX - EIGRP external, O - OSPF, IA - OSPF inter area
       N1 - OSPF NSSA external type 1, N2 - OSPF NSSA external type 2
       E1 - OSPF external type 1, E2 - OSPF external type 2
       i - IS-IS, su - IS-IS summary, L1 - IS-IS level-1, L2 - IS-IS level-2
       ia - IS-IS inter area, * - candidate default, U - per-user static
route
       o - ODR, P - periodic downloaded static route

Gateway of last resort is not set

     1.0.0.0/31 is subnetted, 1 subnets
C 1.1.1.0 is directly connected, Serial0/0.1

--
Garry L. Baker
"There is no 'patch' for stupidity." - www.sqlsecurity.com
On Sat, Jul 31, 2010 at 6:41 PM, Youssif, Ahmed <YoussiffA_at_aecl.com> wrote:
>  Thanks,
>
> But can I use it with frame-relay sub-interfaces or I cant
>
>
>
> Regards,
>
> *Ahmed Ossama Youssiff.*
>
> * *
>
> *From:* garry baker [mailto:baker.garry_at_gmail.com]
> *Sent:* Saturday, July 31, 2010 6:38 PM
> *To:* Youssif, Ahmed
> *Subject:* Re: /31 mask
>
>
>
> if it is a point to point i dont see why not, do not think it will break
> anything, that is the proposal of the RFC behind it...
>
>
>
http://www.cisco.com/en/US/docs/ios/12_2t/12_2t2/feature/guide/ft31addr.html
>
> i have only ever used it on ppp or hdlc links though and only in a lab
> environment
>
>
> --
> Garry L. Baker
>
> "There is no 'patch' for stupidity." - www.sqlsecurity.com
>
>  On Sat, Jul 31, 2010 at 6:25 PM, Youssif, Ahmed <YoussiffA_at_aecl.com>
> wrote:
>
> Dears,
> Can I use /31 mask on frame-relay interfaces?
> When I asked to configure the largest mask possible on frame-relay link,
> shall
> I use /30 or /31.
>
> Please respond quickly.
> Regards,
> Ahmed Ossama Youssiff.
> Implementation Manager.
> Telecom Systems Business Unit.
> Advanced Electronics Company.
> PO Box 90916, Riyadh 11623.
> Tel: +96612056111 Ext. 7018.
> Mobile: +966531567747.
> Fax.: +96612059044.
>
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