From: Ivan (ivan@iip.net)
Date: Tue Jul 25 2006 - 09:59:18 ART
In AutoRP all mapping agents must announce the same information. In this case
MA have not consistent information. I think to test this. Need have only one
MA for all RP.
Probably R4 get AutoRP-discovery from R1 after announce from itself. To see
this situation more deeply need to debug all process RP-mapping.
> Nick,
>
> When a negative group-range is received through Auto-RP, a group in the
> range will be treated as dense mode group.
> What's more important is that even if you had another RP advertising a
> normal (positive) group-range, the negative one will override it across
> your PIM domain.
>
> Here's my testing of the override process:
>
> R1 and R4 connected through a common ethernet segment:
>
> hostanme Rack1R1
> ip multicast-routing
>
> interface Loopback0
> ip address 150.1.1.1 255.255.255.0
> no ip directed-broadcast
> ip pim sparse-dense-mode
> !
> interface FastEthernet0/0
> ip address 155.1.146.1 255.255.255.0
> no ip directed-broadcast
> ip pim sparse-dense-mode
>
> ip pim send-rp-announce Loopback0 scope 10 group-list 1
> ip pim send-rp-discovery scope 10
> !
> access-list 1 deny 239.0.0.0 0.0.0.255
> access-list 1 permit 224.0.0.0 7.255.255.255
>
>
> hostname Rack1R4
> ip multicast-routing
>
> interface Loopback0
> ip address 150.1.4.4 255.255.255.0
> ip pim sparse-dense-mode
>
> interface FastEthernet0/1
> ip address 155.1.146.4 255.255.255.0
> ip pim sparse-dense-mode
> duplex auto
> speed auto
>
> ip pim send-rp-announce Loopback0 scope 10 group-list 1
> ip pim rp-candidate Loopback0 group-list 10 priority 1
>
> access-list 1 permit 239.0.0.0 0.0.0.255
>
>
> As you see, Router1 announces 224/5 but also (negativelly) 239/8.
> Router 4 announces 239/8 normally.
>
> Check R4's opinion on the group-to-rp mapping:
> Rack1R4#sh ip pim rp mapping
> PIM Group-to-RP Mappings
> This system is an RP (Auto-RP)
> This system is a candidate RP (v2)
>
> Group(s) 224.0.0.0/5
> RP 150.1.1.1 (?), v2v1
> Info source: 150.1.1.1 (?), elected via Auto-RP
> Uptime: 00:04:45, expires: 00:02:11
> Group(s) (-)239.0.0.0/24
> RP 150.1.1.1 (?), v2v1
> Info source: 150.1.1.1 (?), elected via Auto-RP
> Uptime: 00:04:45, expires: 00:02:09
> Rack1R4#
>
>
> Although R4 announes 239/8 :
>
> Auto-RP(0): Build RP-Announce for 150.1.4.4, PIMv2/v1, ttl 10, ht 181
> Auto-RP(0): Build announce entry for (239.0.0.0/24)
> Auto-RP(0): Send RP-Announce packet on FastEthernet0/1
>
>
> R1(the mapping agent) ignores and send the -239/8:
>
> Auto-RP(0): Build RP-Announce for 150.1.4.4, PIMv2/v1, ttl 10, ht 181
> Auto-RP(0): Build announce entry for (239.0.0.0/24)
> Auto-RP(0): Send RP-Announce packet on FastEthernet0/1
>
> On 7/25/06, Nick Davey <nicky.davey@gmail.com> wrote:
> > Thanks Rado,
> >
> > So does that mean that this group does not have an RP ?
> >
> > Nick
> >
> > On 7/25/06, Radoslav Vasilev < deckland@gmail.com> wrote:
> > > Hi Nick,
> > >
> > > What you've done is a negative announcement for the administrativelly
> > > scoped range 239/8.
> > > This happen when you have a deny statement in the standard ACL you use
> > > on the RP.
> > >
> > > I think the "negative prefix" feauture for Auto-RP was addes somewhere
> > > in 12.0
> > >
> > >
> > > Cheers,
> > > Rado
> > >
> > > On 7/25/06, Nick Davey < nicky.davey@gmail.com> wrote:
> > > > Hi all,
> > >
> > > I configured autorp as follows:
> > >
> > > ip pim send-rp-announce Loopback0 scope 16 group-list MCast
> > >
> > > ip access-list standard MCast
> > > deny 239.0.0.0 0.255.255.255
> > > permit 232.0.0.0 7.255.255.255
> > >
> > >
> > > When i do a show ip pim rp mapping i see the following
> > >
> > > Group(s) 232.0.0.0/5
> > > RP 150.1.6.6 (?), v2v1
> > > Info source: 150.1.6.6 (?), elected via Auto-RP
> > > Uptime: 00:32:43, expires: 00:02:13
> > > Group(s) (-)239.0.0.0/8
> > > RP 150.1.6.6 (?), v2v1
> > > Info source: 150.1.6.6 (?), elected via Auto-RP
> > > Uptime: 00:32:43, expires: 00:02:16
> > >
> > >
> > > Why is group 239.0.0.0 assigned an RP when it is denied in the ACL?
> > >
> > > And what does the (-) before 239.0.0.0/8 mean?
> > >
> > > Hope someone can answer this
> > >
> > > Regards,
> > >
> > > Nick
> > >
> > > _______________________________________________________________________
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>
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-- Ivan
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