Multipoint GRE Tunnel and FR

From: Rodrigo Paes (rpaes@pobox.com)
Date: Sat Nov 04 2006 - 17:42:36 ART


Hi GS,

   anyone can give an answer and point me to an url that explains why the first config works and the second doesn't ?

Rack1R3#sh run int s2/0.1245
Building configuration...

Current configuration : 175 bytes
!
interface Serial2/0.1245 point-to-point
 ip address 136.1.0.3 255.255.255.0
 ip ospf network point-to-multipoint
 ip ospf priority 0
 frame-relay interface-dlci 305
end

Rack1R3#
Rack1R3#sh run int tu1245
Building configuration...

Current configuration : 318 bytes
!
interface Tunnel1245
 ip address 100.0.0.3 255.255.255.0
 no ip redirects
 ip nhrp authentication CISCO
 ip nhrp map 100.0.0.5 150.50.5.5
 ip nhrp map multicast 150.50.5.5
 ip nhrp network-id 1245
 ip nhrp holdtime 30
 ip nhrp nhs 100.0.0.5
 tunnel source Loopback0
 tunnel mode gre multipoint
 tunnel key 1245
end

Rack1R3#
T-SERVER#5
[Resuming connection 5 to R5 ... ]

Rack1R5#
Rack1R5#sh ip nhrp
100.0.0.3/32 via 100.0.0.3, Tunnel1245 created 00:06:41, expire 00:00:22
  Type: dynamic, Flags: authoritative unique registered used
  NBMA address: 150.50.3.3
Rack1R5#
Rack1R5#

this one doesn't ... and the only difference is the that this one is "multipoint" instead of "point-to-point"

Rack1R2#sh run int s2/0.1245
Building configuration...

Current configuration : 276 bytes
!
interface Serial2/0.1245 multipoint
 ip address 136.1.0.2 255.255.255.0
 ip ospf network point-to-multipoint
 ip ospf priority 0
 frame-relay map ip 136.1.0.1 205
 frame-relay map ip 136.1.0.4 205
 frame-relay map ip 136.1.0.5 205 broadcast
 no frame-relay inverse-arp
end

Rack1R2#
Rack1R2#sh run int tu1245
Building configuration...

Current configuration : 297 bytes
!
interface Tunnel1245
 ip address 100.0.0.2 255.255.255.0
 no ip redirects
 ip nhrp authentication CISCO
 ip nhrp map 100.0.0.5 150.50.5.5
 ip nhrp map multicast 150.50.5.5
 ip nhrp network-id 1245
 ip nhrp nhs 100.0.0.5
 tunnel source Loopback0
 tunnel mode gre multipoint
 tunnel key 1245
end

Rack1R2#

ps: I'm using dynamips ... I'm sure that doesn't help :P

[]s
rodrigo



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