Yea. It doesn't make sense in practical but you know CCIE exam is not 100% related to what we are seeing in production. After a few practice labs, i feel like the lab exam is testing the theory/knowledge and how can we do on tips and tricks with Cisco IOS. Last time, I asked in OSL before , multipoint GRE question 2 routers connected via FE, but IP only talk via tunnel, the tunnel is not static souce/destination IP but with multipoint GRE. somemore, OSPF are 0 is asked to configured on that interface only not on other interface. If we cannot turn on that tunnel, the whole OSPF will gone because of OSPF are 0 and IGP section will fail. IGP section fail will definitely fail the exam already. We don't expect that in production and I don't think people using that way also. Even using like that, it will be the bad design.
Regards, Phyo ________________________________ From: Bojan Zivancevic <[email protected]> To: "[email protected]" <[email protected]> Sent: Wednesday, November 24, 2010 3:59:40 Subject: Re: [OSL | CCIE_RS] [OLS | CCIE_RS] PPP multilink Well, never thought of it, I admit... It makes no sense to use /32 that’s for sure, just did not use little gray brain cells... Best Regards, Bojan Zivancevic Network Engineer From:Tyson Scott [mailto:[email protected]] Sent: Tuesday, November 23, 2010 19:36 To: Bojan Zivancevic; [email protected] Subject: RE: [OSL | CCIE_RS] [OLS | CCIE_RS] PPP multilink Is there any interface besides the loopback that you can configure a /32 address on? Regards, Tyson Scott - CCIE #13513 R&S, Security, and SP Managing Partner / Sr. Instructor- IPexpert, Inc. Mailto: [email protected] Telephone: +1.810.326.1444, ext. 208 Live Assistance, Please visit: www.ipexpert.com/chat eFax: +1.810.454.0130 IPexpert is a premier provider of Self-Study Workbooks, Video on Demand, Audio Tools, Online Hardware Rental and Classroom Training for the Cisco CCIE (R&S, Voice, Security & Service Provider) certification(s) with training locations throughout the United States, Europe, South Asia and Australia. Be sure to visit our online communities at www.ipexpert.com/communities and our public website at www.ipexpert.com From:[email protected] [mailto:[email protected]] On Behalf Of Bojan Zivancevic Sent: Tuesday, November 23, 2010 12:41 PM To: [email protected] Subject: Re: [OSL | CCIE_RS] [OLS | CCIE_RS] PPP multilink Can someone explain the behavior about not being able to configure /32 on PPP multilink? Best Regards, Bojan Zivancevic Network Engineer From:Tyson Scott [mailto:[email protected]] Sent: Tuesday, November 23, 2010 18:15 To: 'Aung Phyo Lwin'; [email protected] Subject: Re: [OSL | CCIE_RS] [OLS | CCIE_RS] PPP multilink Yep, PPP by default always installs the neighbor route as a /32 network so that is how a situation like this will function. Regards, Tyson Scott - CCIE #13513 R&S, Security, and SP Managing Partner / Sr. Instructor- IPexpert, Inc. Mailto: [email protected] Telephone: +1.810.326.1444, ext. 208 Live Assistance, Please visit: www.ipexpert.com/chat eFax: +1.810.454.0130 IPexpert is a premier provider of Self-Study Workbooks, Video on Demand, Audio Tools, Online Hardware Rental and Classroom Training for the Cisco CCIE (R&S, Voice, Security & Service Provider) certification(s) with training locations throughout the United States, Europe, South Asia and Australia. Be sure to visit our online communities at www.ipexpert.com/communities and our public website at www.ipexpert.com From:[email protected] [mailto:[email protected]] On Behalf Of Aung Phyo Lwin Sent: Tuesday, November 23, 2010 11:46 AM To: [email protected] Subject: [OSL | CCIE_RS] [OLS | CCIE_RS] PPP multilink Hi, Normally, we cannot configure /32 IP on the PPP multilink. Atlease /31 need to configure. But if use ip unnumber to loopback interface which has /32 IP, then this PPP multilink interface will get the /32 IP. Let say R1 loopback is 1.1.1.1/32 and R2 loopback is 3.3.3.3/32 , R1 and R2 between is Multilink ppp. These 2 IP can ping each other. In the routing table, it show as connected route. Gateway of last resort is not set 1.0.0.0/32 is subnetted, 1 subnets C 1.1.1.1 is directly connected, Loopback1 3.0.0.0/32 is subnetted, 1 subnets C 3.3.3.3 is directly connected, Multilink1 This is the debug logs *Mar 1 01:23:48.159: Vi1 MLP: O ppp IP (0021) size 106 encsize 6 *Mar 1 01:23:48.159: Vi1 MLP: O data 1871 03CF 0021 4500 0064 008A 0000 FF01 *Mar 1 01:23:48.195: Vi1 MLP: I ppp IP (0021) size 104 encsize 4 *Mar 1 01:23:48.199: Vi1 MLP: I data FF03 0021 4500 0064 008B 0000 FF01 B306 *Mar 1 01:23:48.203: ICMP: echo reply sent, src 1.1.1.1, dst 3.3.3.3 *Mar 1 01:23:48.203: Vi1 MLP: O ppp IP (0021) size 106 encsize 6 *Mar 1 01:23:48.203: Vi1 MLP: O data 1871 03CF 0021 4500 0064 008B 0000 FF01 In workbooks, most of the examples are used /24, /30, /31 all same subnets. Not different subnet. I just want to know how these packets travel over multilink ppp. Regards,
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