LAB 4: DMVPN OSPF. OSPF over DMVPN. Disclaimer. Pag e

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1 LAB 4: DMVPN OSPF Disclaimr This Configuration Guid is dsignd to assist mmbrs to nhanc thir skills in rspctiv tchnology ara. Whil vry ffort has bn mad to nsur that all matrial is as complt and accurat as possibl, th nclosd matrial is prsntd on an as is basis. Nithr th authors nor Forum assum any liability or rsponsibility to any prson or ntity with rspct to loss or damags incurrd from th information containd in this guid. This Lab Guid was dvlopd by RSTForum. Any similaritis btwn matrial prsntd in this configuration guid and any othr matrial is compltly coincidntal. OSPF ovr DMVPN

2 LAB 4: Diagram Not: This Lab was dvlopd on Cisco IOS Vrsion15.2(4) M1 ADVENTERPRISEK9-M.

3 LAB 4: Configuration OSPF ovr DMVPN Stp 1: Enabl loopback and physical intrfacs on R1, R2, R3, R4 and R5. R1: intrfac FastEthrnt0/0 ip addrss intrfac Loopback1 ip addrss R2: intrfac FastEthrnt1/0 ip addrss intrfac Loopback1 ip addrss R3: intrfac FastEthrnt2/0 ip addrss intrfac Loopback1 ip addrss R4: intrfac FastEthrnt3/0 ip addrss intrfac Loopback1 ip addrss

4 R5: intrfac FastEthrnt0/0 ip addrss intrfac FastEthrnt1/0 ip addrss intrfac FastEthrnt2/0 ip addrss intrfac FastEthrnt3/0 ip addrss Stp2: Assign dfault rout pointing towards intrnt. R1: ip rout R2: ip rout R3: ip rout R4: ip rout Stp3: Configur DMVPN R1: intrfac Tunnl 0 ip addrss !(logical ip addrss) ip nhrp map multicast dynamic!(nabl multicast traffic) ip nhrp ntwork-id 5!(assign sam ntwork-id ls tunnl will not form) tunnl sourc !(physical addrss of HUB intrfac)

5 tunnl mod gr multipoint ip mtu 1400!(slct gr mod)!(chang mtu for DMVPN hadr) R2: intrfac Tunnl 0 ip addrss ip nhrp ntwork-id 5 tunnl sourc ip nhrp map !(pointing towards NHS srvr) ip nhrp map multicast !(allow multicast traffic from R2 (spok) to R1 (Hub)) ip nhrp nhs !(dsignats R1 as th NHS) tunnl mod gr multipoint ip mtu 1400 R3: intrfac Tunnl 0 ip addrss ip nhrp ntwork-id 5 tunnl sourc ip nhrp map ip nhrp map multicast ip nhrp nhs tunnl mod gr multipoint ip mtu 1400 R4: intrfac Tunnl 0 ip addrss ip nhrp ntwork-id 5 tunnl sourc ip nhrp map ip nhrp map multicast ip nhrp nhs tunnl mod gr multipoint ip mtu 1400

6 Stp 4: Configur OSPF on routr. R1: routr ospf 1 ntwork ara 0 ntwork ara 0 intrfac tunnl 0 ip ospf ntwork broadcast ip ospf priority 255 R2: routr ospf 1 ntwork ara 0 ntwork ara 0 intrfac tunnl 0 ip ospf ntwork broadcast ip ospf priority 255 R3: routr ospf 1 ntwork ara 0 ntwork ara 0 intrfac tunnl 0 ip ospf ntwork broadcast ip ospf priority 255 R4: routr ospf 1 ntwork ara 0 ntwork ara 0 intrfac tunnl 0 ip ospf ntwork broadcast ip ospf priority 255

7 Stp 5: Vrification R1#show ip rout Cods: L - local, C - connctd, S - static, R - RIP, M - mobil, B - BGP D - EIGRP, EX - EIGRP xtrnal, O - OSPF, IA - OSPF intr ara N1 - OSPF NSSA xtrnal typ 1, N2 - OSPF NSSA xtrnal typ 2 E1 - OSPF xtrnal typ 1, E2 - OSPF xtrnal typ 2 i - IS-IS, su - IS-IS summary, L1 - IS-IS lvl-1, L2 - IS-IS lvl-2 ia - IS-IS intr ara, * - candidat dfault, U - pr-usr static rout o - ODR, P - priodic downloadd static rout, H - NHRP, l - LISP + - rplicatd rout, % - nxt hop ovrrid Gatway of last rsort is to ntwork S* /0 [1/0] via /8 is variably subnttd, 2 subnts, 2 masks C /24 is dirctly connctd, Loopback1 L /32 is dirctly connctd, Loopback /32 is subnttd, 1 subnts O [110/1001] via , 00:10:06, Tunnl /32 is subnttd, 1 subnts O [110/1001] via , 00:08:57, Tunnl /32 is subnttd, 1 subnts O [110/1001] via , 00:07:58, Tunnl /16 is variably subnttd, 2 subnts, 2 masks C /30 is dirctly connctd, FastEthrnt0/0 L /32 is dirctly connctd, FastEthrnt0/ /24 is variably subnttd, 2 subnts, 2 masks C /24 is dirctly connctd, Tunnl0 L /32 is dirctly connctd, Tunnl0 R2#show ip rout Cods: L - local, C - connctd, S - static, R - RIP, M - mobil, B - BGP D - EIGRP, EX - EIGRP xtrnal, O - OSPF, IA - OSPF intr ara N1 - OSPF NSSA xtrnal typ 1, N2 - OSPF NSSA xtrnal typ 2 E1 - OSPF xtrnal typ 1, E2 - OSPF xtrnal typ 2 i - IS-IS, su - IS-IS summary, L1 - IS-IS lvl-1, L2 - IS-IS lvl-2 ia - IS-IS intr ara, * - candidat dfault, U - pr-usr static rout o - ODR, P - priodic downloadd static rout, H - NHRP, l - LISP + - rplicatd rout, % - nxt hop ovrrid Gatway of last rsort is to ntwork S* /0 [1/0] via

8 O C L O O C L C L /32 is subnttd, 1 subnts [110/1001] via , 00:11:15, Tunnl /8 is variably subnttd, 2 subnts, 2 masks /24 is dirctly connctd, Loopback /32 is dirctly connctd, Loopback /32 is subnttd, 1 subnts [110/1001] via , 00:10:04, Tunnl /32 is subnttd, 1 subnts [110/1001] via , 00:09:05, Tunnl /16 is variably subnttd, 2 subnts, 2 masks /30 is dirctly connctd, FastEthrnt1/ /32 is dirctly connctd, FastEthrnt1/ /24 is variably subnttd, 2 subnts, 2 masks /24 is dirctly connctd, Tunnl /32 is dirctly connctd, Tunnl0 R3#show ip rout Cods: L - local, C - connctd, S - static, R - RIP, M - mobil, B - BGP D - EIGRP, EX - EIGRP xtrnal, O - OSPF, IA - OSPF intr ara N1 - OSPF NSSA xtrnal typ 1, N2 - OSPF NSSA xtrnal typ 2 E1 - OSPF xtrnal typ 1, E2 - OSPF xtrnal typ 2 i - IS-IS, su - IS-IS summary, L1 - IS-IS lvl-1, L2 - IS-IS lvl-2 ia - IS-IS intr ara, * - candidat dfault, U - pr-usr static rout o - ODR, P - priodic downloadd static rout, H - NHRP, l - LISP + - rplicatd rout, % - nxt hop ovrrid Gatway of last rsort is to ntwork S* /0 [1/0] via /32 is subnttd, 1 subnts O [110/1001] via , 00:11:23, Tunnl /32 is subnttd, 1 subnts O [110/1001] via , 00:11:23, Tunnl /8 is variably subnttd, 2 subnts, 2 masks C /24 is dirctly connctd, Loopback1 L /32 is dirctly connctd, Loopback /32 is subnttd, 1 subnts O [110/1001] via , 00:10:05, Tunnl /16 is variably subnttd, 2 subnts, 2 masks C /30 is dirctly connctd, FastEthrnt2/0 L /32 is dirctly connctd, FastEthrnt2/ /24 is variably subnttd, 2 subnts, 2 masks C /24 is dirctly connctd, Tunnl0 L /32 is dirctly connctd, Tunnl0

9 R4#show ip rout Cods: L - local, C - connctd, S - static, R - RIP, M - mobil, B - BGP D - EIGRP, EX - EIGRP xtrnal, O - OSPF, IA - OSPF intr ara N1 - OSPF NSSA xtrnal typ 1, N2 - OSPF NSSA xtrnal typ 2 E1 - OSPF xtrnal typ 1, E2 - OSPF xtrnal typ 2 i - IS-IS, su - IS-IS summary, L1 - IS-IS lvl-1, L2 - IS-IS lvl-2 ia - IS-IS intr ara, * - candidat dfault, U - pr-usr static rout o - ODR, P - priodic downloadd static rout, H - NHRP, l - LISP + - rplicatd rout, % - nxt hop ovrrid Gatway of last rsort is to ntwork S* /0 [1/0] via /32 is subnttd, 1 subnts O [110/1001] via , 00:11:14, Tunnl /32 is subnttd, 1 subnts O [110/1001] via , 00:11:14, Tunnl /32 is subnttd, 1 subnts O [110/1001] via , 00:11:14, Tunnl /8 is variably subnttd, 2 subnts, 2 masks C /24 is dirctly connctd, Loopback1 L /32 is dirctly connctd, Loopback /16 is variably subnttd, 2 subnts, 2 masks C /30 is dirctly connctd, FastEthrnt3/0 L /32 is dirctly connctd, FastEthrnt3/ /24 is variably subnttd, 2 subnts, 2 masks C /24 is dirctly connctd, Tunnl0 L /32 is dirctly connctd, Tunnl0 R1#show ip ospf nighbor Nighbor ID Pri Stat Dad Tim Addrss Intrfac FULL/DROTHER 00:00: Tunnl FULL/DROTHER 00:00: Tunnl FULL/DROTHER 00:00: Tunnl0 R2#show ip ospf nighbor Nighbor ID Pri Stat Dad Tim Addrss Intrfac FULL/DR 00:00: Tunnl0 R3#show ip ospf nighbor

10 Nighbor ID Pri Stat Dad Tim Addrss Intrfac FULL/DR 00:00: Tunnl0 R4#show ip ospf nighbor Nighbor ID Pri Stat Dad Tim Addrss Intrfac FULL/DR 00:00: Tunnl0 R1#show dmvpn Lgnd: Attrb --> S - Static, D - Dynamic, I - Incomplt N - NATd, L - Local, X - No Sockt # Ent --> Numbr of NHRP ntris with sam NBMA pr NHS Status: E --> Expcting Rplis, R --> Rsponding, W --> Waiting UpDn Tim --> Up or Down Tim for a Tunnl ============================================== ======================== Intrfac: Tunnl0, IPv4 NHRP Dtails Typ:Hub, NHRP Prs:3, # Ent Pr NBMA Addr Pr Tunnl Add Stat UpDn Tm Attrb UP 01:43:30 D UP 01:42:56 D UP 01:42:27 D R2#show dmvpn Lgnd: Attrb --> S - Static, D - Dynamic, I - Incomplt N - NATd, L - Local, X - No Sockt # Ent --> Numbr of NHRP ntris with sam NBMA pr NHS Status: E --> Expcting Rplis, R --> Rsponding, W --> Waiting UpDn Tim --> Up or Down Tim for a Tunnl ============================================== ======================== Intrfac: Tunnl0, IPv4 NHRP Dtails Typ:Spok, NHRP Prs:2, # Ent Pr NBMA Addr Pr Tunnl Add Stat UpDn Tm Attrb UP 01:43:15 S R3#show dmvpn Lgnd: Attrb --> S - Static, D - Dynamic, I - Incomplt N - NATd, L - Local, X - No Sockt # Ent --> Numbr of NHRP ntris with sam NBMA pr NHS Status: E --> Expcting Rplis, R --> Rsponding, W --> Waiting UpDn Tim --> Up or Down Tim for a Tunnl

11 ============================================== ======================= Intrfac: Tunnl0, IPv4 NHRP Dtails Typ:Spok, NHRP Prs:1, # Ent Pr NBMA Addr Pr Tunnl Add Stat UpDn Tm Attrb UP 01:41:40 S R4#show dmvpn Lgnd: Attrb --> S - Static, D - Dynamic, I - Incomplt N - NATd, L - Local, X - No Sockt # Ent --> Numbr of NHRP ntris with sam NBMA pr NHS Status: E --> Expcting Rplis, R --> Rsponding, W --> Waiting UpDn Tim --> Up or Down Tim for a Tunnl ============================================== ======================== Intrfac: Tunnl0, IPv4 NHRP Dtails Typ:Spok, NHRP Prs:2, # Ent Pr NBMA Addr Pr Tunnl Add Stat UpDn Tm Attrb UP 01:47:10 S R2#ping Typ scap squnc to abort. Snding 5, 100-byt ICMP Echos to , timout is 2 sconds:!!!!! Succss rat is 100 prcnt (5/5), round-trip min/avg/max = 148/173/224 ms R2#tracrout sourc loopback 1 Typ scap squnc to abort. Tracing th rout to VRF info: (vrf in nam/id, vrf out nam/id) msc 92 msc msc 80 msc (Spok routr R2 ia abl to rach R4 via hub i R1. A packt dstind from R2 to R4 would nd to b routd through R1to R2 tunnl and gt rncapsulatd to ntr R4 tunnl.) R2#show dmvpn Lgnd: Attrb --> S - Static, D - Dynamic, I - Incomplt N - NATd, L - Local, X - No Sockt # Ent --> Numbr of NHRP ntris with sam NBMA pr NHS Status: E --> Expcting Rplis, R --> Rsponding, W --> Waiting

12 UpDn Tim --> Up or Down Tim for a Tunnl ============================================== ======================== Intrfac: Tunnl0, IPv4 NHRP Dtails Typ:Spok, NHRP Prs:2, # Ent Pr NBMA Addr Pr Tunnl Add Stat UpDn Tm Attrb UP 01:43:15 S UP 01:32:00 D (Onc th dynamically tunnl is formd btwn spok to spok routr, DMVPN allows to spok to spok dirctly communication at nxt hop thus bypassing hub routr compltly.)