Re: /31 mask

It depends. This is one of those things where I would definitely clear
the issue with the lab Proctor.

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On Sat, Jul 31, 2010 at 09:05, Youssif, Ahmed <YoussiffA_at_aecl.com> wrote:
> Dear,
> Thanks for your kind support.
> Really thanks.
> So, if I were asked to implement the largest mask possible, I should use /31.
> Right?
>
> 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.
>
> From: garry baker [mailto:baker.garry_at_gmail.com]
> Sent: Saturday, July 31, 2010 6:56 PM
> To: Youssif, Ahmed
> Cc: Cisco certification
> Subject: 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
> B ip address 1.1.1.0 255.255.255.254
> B snmp trap link-status
> B 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
> B  B  B  D - EIGRP, EX - EIGRP external, O - OSPF, IA - OSPF inter area
> B  B  B  N1 - OSPF NSSA external type 1, N2 - OSPF NSSA external type 2
> B  B  B  E1 - OSPF external type 1, E2 - OSPF external type 2
> B  B  B  i - IS-IS, su - IS-IS summary, L1 - IS-IS level-1, L2 - IS-IS level-2
> B  B  B  ia - IS-IS inter area, * - candidate default, U - per-user static
> route
> B  B  B  o - ODR, P - periodic downloaded static route
>
> Gateway of last resort is not set
>
> B  B  1.0.0.0/31<http://1.0.0.0/31> is subnetted, 1 subnets
> C B  B  B  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
> B ip address 1.1.1.1 255.255.255.254
> B snmp trap link-status
> B 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
> B  B  B  D - EIGRP, EX - EIGRP external, O - OSPF, IA - OSPF inter area
> B  B  B  N1 - OSPF NSSA external type 1, N2 - OSPF NSSA external type 2
> B  B  B  E1 - OSPF external type 1, E2 - OSPF external type 2
> B  B  B  i - IS-IS, su - IS-IS summary, L1 - IS-IS level-1, L2 - IS-IS level-2
> B  B  B  ia - IS-IS inter area, * - candidate default, U - per-user static
> route
> B  B  B  o - ODR, P - periodic downloaded static route
>
> Gateway of last resort is not set
>
> B  B  1.0.0.0/31<http://1.0.0.0/31> is subnetted, 1 subnets
> C B  B  B  1.1.1.0 is directly connected, Serial0/0.1
>
>
>
>
>
> --
> Garry L. Baker
>
> "There is no 'patch' for stupidity." -
> www.sqlsecurity.com<http://www.sqlsecurity.com>
>
> On Sat, Jul 31, 2010 at 6:41 PM, Youssif, Ahmed
> <YoussiffA_at_aecl.com<mailto:YoussiffA_at_aecl.com>> wrote:
> Thanks,
> But can I use it with frame-relay sub-interfaces or I can't...
>
> Regards,
> Ahmed Ossama Youssiff.
>
> From: garry baker
> [mailto:baker.garry_at_gmail.com<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<http://www.sqlsecurity.com>
> On Sat, Jul 31, 2010 at 6:25 PM, Youssif, Ahmed
> <YoussiffA_at_aecl.com<mailto: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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