AUTO-TUNNEL CREATION

[pranavsidam]

I just configured  my  router for connection with exchange using ospf routing protocol to receive multicast traffic.

but when i issue the command "show ip int brief " on my router it shows tunnel interface.The interface is automatically created and the source ip is the ip assigned to wan interface of my router.

is this because i configured ip pim sparse mode on my wan interface.

[Georg Pauwen]

Hello,

post the configuration of your router. What do you mean with 'exchange' ?

[pranavsidam]

exchange means trading exchange from where i want multicast.

router config:

interface GigabitEthernet0/0
 description ***** MEMBER LAN *****
 ip address 10.y.y.y 255.255.255.192
 ip access-group 168 in
 no ip redirects
 no ip proxy-arp
 ip pim sparse-mode
 duplex full
 speed 1000
!
interface GigabitEthernet0/1
 description ***** NCDEX WAN *****
 bandwidth 2048
 ip address 10.x.x.x.x 255.255.255.252
 no ip redirects
 no ip proxy-arp
 ip pim sparse-mode
 ip igmp join-group 239.x.x.x
 ip igmp join-group 239.x.x.x
 duplex full
 speed 100

!

router ospf 2
 router-id 10.y.y.y
 network 10.x.0.0 0.0.255.255 area 2
 network 10.y.0.0 0.0.255.255 area 2

!

ip pim rp-address 10.z.z.z NCDEX_MUL override
ip pim rp-address 10.z.z.z NCDEX_DR_MUL override

!

!

access-list 168 permit igmp 10.y.y.y 0.0.0.63 host 239.x.x.x
access-list 168 permit igmp 10.y.y.y 0.0.0.63 host 239.x.x.x
!

!

router#sh ip int br

Interface                  IP-Address      OK? Method Status                Protocol
Embedded-Service-Engine0/0 unassigned      YES NVRAM  administratively down down    
GigabitEthernet0/0         10.y.y.y   YES NVRAM  up                    up      
GigabitEthernet0/1         10.x.x.x   YES NVRAM  up                    up      
Tunnel0                    10.x.x.x   YES unset  up                    up      

[Georg Pauwen · Accepted solution]

Hello,

indeed this is normal behavior when you configure PIM sparse mode. The tunnel is created automatically by the Multicast Forwarding Information Base (MFIB) as part of the PIM sparse-mode registration process.