Re: Mysterious - Tun0 IPv6 interface

Hey Michael,

It is because you are running IPv6 multicast. In IPv6 multicast, you
will see a tunnel come up which is used to register sources/groups to
the RP.

On Thu, Jan 28, 2010 at 2:17 AM, Michael <mamiller2_at_comcast.net> wrote:
> Hello All,
>
>
>
> Can anyone comment on how this Tunnel0 interface appears and why?
>
>
>
> R2#s ipv6 int br
>
> FastEthernet0/0 [up/up]
>
> FE80::C001:4BFF:FE11:0
>
> 2001:12:1:0:C001:4BFF:FE11:0
>
> FastEthernet0/1 [up/up]
>
> FE80::C001:4BFF:FE11:1
>
> 2001:13:1:0:C001:4BFF:FE11:1
>
> Serial1/0 [administratively down/down]
>
> Serial1/1 [administratively down/down]
>
> Serial1/2 [administratively down/down]
>
> Serial1/3 [administratively down/down]
>
> Tunnel0 [up/up] < ---
> This Tunnel0 interface
>
> FE80::C001:4BFF:FE11:0
>
> unnumbered (FastEthernet0/0)
>
> R2#
>
>
>
> R2#s run full
>
> Building configuration...
>
>
>
> Current configuration : 1501 bytes
>
> !
>
> version 12.4
>
> service timestamps debug datetime msec
>
> service timestamps log datetime msec
>
> no service password-encryption
>
> !
>
> hostname R2
>
> !
>
> boot-start-marker
>
> boot-end-marker
>
> !
>
> !
>
> no aaa new-model
>
> memory-size iomem 5
>
> ip cef
>
> !
>
> !
>
> !
>
> !
>
> no ip domain lookup
>
> ip multicast-routing
>
> ipv6 unicast-routing
>
> ipv6 cef
>
> ipv6 multicast-routing
>
> !
>
> multilink bundle-name authenticated
>
> !
>
> !!
>
> archive
>
> log config
>
> hidekeys
>
> !
>
>
>
> interface FastEthernet0/0
>
> ip address 66.12.1.2 255.255.255.0
>
> speed 100
>
> full-duplex
>
> ipv6 address 2001:12:1::/64 eui-64
>
> ipv6 enable
>
> ipv6 ospf 1 area 0
>
> !
>
> interface FastEthernet0/1
>
> ip address 66.23.1.1 255.255.255.0
>
> speed 100
>
> full-duplex
>
> ipv6 address 2001:13:1::/64 eui-64
>
> ipv6 enable
>
> ipv6 ospf 1 area 0
>
> !
>
> interface Serial1/0
>
> no ip address
>
> shutdown
>
> serial restart-delay 0
>
> !
>
> interface Serial1/1
>
> no ip address
>
> shutdown
>
> serial restart-delay 0
>
> !
>
> interface Serial1/2
>
> no ip address
>
> shutdown
>
> serial restart-delay 0
>
> !
>
> interface Serial1/3
>
> no ip address
>
> shutdown
>
> serial restart-delay 0
>
> !
>
> ip forward-protocol nd
>
> !
>
> !
>
> ip http server
>
> no ip http secure-server
>
> !
>
> ipv6 router ospf 1
>
> router-id 2.2.2.2
>
> log-adjacency-changes
>
> !
>
>
>
> !
>
> control-plane
>
> !
>
> !
>
> !!
>
> alias configure e end
>
> alias configure ds do show ip route
>
> alias configure da do show ip access-list
>
> alias exec c config t
>
> alias exec ds show ip route
>
> alias exec da show ip access-list
>
> !
>
> line con 0
>
> exec-timeout 0 0
>
> logging synchronous
>
> line aux 0
>
> line vty 0 4
>
> login
>
> !
>
> !
>
> end
>
>
>
> R2#
>
>
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>
>
>
>
>
>

-- 
Regards,
Joe Astorino CCIE #24347 (R&S)
Sr. Technical Instructor - IPexpert
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