Re: Query--IPv6 Multicast and OSPF v2

Hey Sunil,

1- when you config ipv6 multcast-routing all ipv6 interfaces will have pim
enabled, it's the opposite of ipv4 that you need to config it per interface,
in ipv6 if you do not want that interface flooding mcast you can config no
ipv6 pim. MLDv1 is the same as IGMPv2, so after enabling ipv6 mcast routing
MLD will be there, so you don't need to do nothing.

2- doesn't matter how many hellos we are sending could be hundreds of
thousand, if OSPF does not receive a hello under 1sec the adj goes down.

BR

Alberto

On 2 July 2011 17:02, Sunil pareek <skpareek84_at_gmail.com> wrote:

> Hi
>
> I have two queries related to IPV6 multicast and ospf v2 timer.
>
> 1.In IPv6 multicast ; to get it work we configure ipv6 multicast routing in
> global mode and then configure the ipv6 pim rp(static or BSR).I have not
> seen per interface pim sparse mode enable as we do in ipv4.Also IGMP had
> gone and we are having MLD.So question is when there is no config for pim
> at
> the interface level so whenever a host want to join a group it sends mld
> join to the first hop router.How this join message will reach to the RP(on
> Shared tree) I mean is it a PIM join like IPV4 or its a MLD join which
> travel hop by hop upto RP.
>
>
> 2. Second little query is about OSPF fast hellos.If we configure ip ospf
> dead-interval minimal 4 then I can understand that hello time will be 250ms
> and 4 hello missed OSPF neighborship will go down.But in the context
> sensitive help we can make it as small as 20.in that case under sh ip ospf
> interface it show hello time 50ms and dead time 1 sec.Now I dont understand
> how many hellos will be missed before making the neighborship down.What
> about that rule of 4.Is it the case where also the router have to miss 20
> hellos before making the neighbor down as dead interval is still 1 sec.If
> yes then please help me to understand significance of this.
>
>
> Please have some time to answer this.
>
> Regards
> Sunil
>
>
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