Re: Multicast Helper-map issue

Hi Nate

Checking your sh ip mroute, I see a cause for concern...

R3(config)#do sh ip mroute 224.1.1.1

(*, 224.1.1.1), 00:36:26/00:02:59, RP 2.2.2.2, flags: SJCL

  Incoming interface: FastEthernet0/1, RPF nbr *10.1.34.3* <--------
  Outgoing interface list:
    FastEthernet0/0, Forward/Sparse, 00:36:26/00:02:02

(10.1.12.1, 224.1.1.1), 00:01:33/00:01:26, flags: LJ

  Incoming interface: Null, RPF nbr 0.0.0.0
  Outgoing interface list:
    FastEthernet0/1, Forward/Sparse, 00:01:33/00:02:58
    FastEthernet0/0, Forward/Sparse, 00:01:33/00:02:02

RPF nbr should be 10.1.23.2
Can you investigate why your route to rp 2.2.2.2 has next hop as 10.1.34.3
instead of 10.1.23.2?

I think your issues are being caused as a result of you using LAN interfaces
all the way through, and perhaps all your lan interfaces are in the same
VLAN.
I imagine if you used point to point serial interfaces between R2 & R3, and
between R3 & R4, you would not see this.
You should be able to get this to work, just make sure your routing is as it
should be.

Either this or you made a typo when posting the output into gs, and the
mroute output is not from R3 :)

Just so you know, I replicated your setup using point to point serials and
all is well:

In my setup:
*Mar 1 03:50:38.387: IP(0): s=10.1.12.1 (FastEthernet0/0) d=224.1.1.1
(Serial0/0.23) id=0, ttl=4, prot=17, len=52(52), mforward
R2(config)#

R5(config-if)#do sh ip ro rip
R 1.0.0.0/8 [120/1] via 10.1.12.1, 00:00:19 --- R1s loopback

2009/11/21 Nate Lee <natetlee_at_gmail.com>

> Thanks again for taking the time to have a look at this. Other than
> Groupstudy, there isn't a very large pool of people you can ask for help on
> some of the CCIE lab topics without watching the other person's eyes glaze
> over :)
>
> Roy - I was under the impression that I would not need PIM enabled on the
> fa0/0 of R2. Is that incorrect? I tried enabling it, but was still unable
> to pass the traffic.
>
> Andrew - I gave it a run with DNS and could not get it working either, I
> added udp 53 to the ip forward-protocol as well as to my ACLs but wasn't
> able to see it on the other side or able to see it leave R2 as a multicast
> for that matter. One thing I noticed is that even after typing in ip
> forward-protocol 53 or ip forward-protocol domain that it does not show up
> in the config. Is this a default setting?
>
> I took a look at my mroute statements as well, and the entries are there,
> however R3 and R4 have Null incoming interfaces for the 10.1.12.1, 224.1.1.1
> entry. I am assuming that this is because they never receive an incoming
> packet from a source for group 224.1.1.1?
>
> Here are the Mroutes:
>
> R2(config)#do sh ip mroute 224.1.1.1
>
>
> (*, 224.1.1.1), 00:34:35/00:03:20, RP 2.2.2.2, flags: S
>
> Incoming interface: Null, RPF nbr 0.0.0.0
> Outgoing interface list:
> FastEthernet0/1, Forward/Sparse, 00:34:35/00:03:20
>
> (10.1.12.1, 224.1.1.1), 00:13:16/00:03:24, flags: T
> Incoming interface: FastEthernet0/0, RPF nbr 0.0.0.0
> Outgoing interface list:
> FastEthernet0/1, Forward/Sparse, 00:13:16/00:03:20
>
> R3(config)#do sh ip mroute 224.1.1.1
>
> (*, 224.1.1.1), 00:36:26/00:02:59, RP 2.2.2.2, flags: SJCL
>
> Incoming interface: FastEthernet0/1, RPF nbr 10.1.34.3
> Outgoing interface list:
> FastEthernet0/0, Forward/Sparse, 00:36:26/00:02:02
>
> (10.1.12.1, 224.1.1.1), 00:01:33/00:01:26, flags: LJ
>
> Incoming interface: Null, RPF nbr 0.0.0.0
> Outgoing interface list:
> FastEthernet0/1, Forward/Sparse, 00:01:33/00:02:58
> FastEthernet0/0, Forward/Sparse, 00:01:33/00:02:02
>
> R4(config)#do sh ip mroute
>
> (*, 224.1.1.1), 00:28:06/00:02:59, RP 2.2.2.2, flags: SJCL
>
> Incoming interface: FastEthernet0/1, RPF nbr 10.1.34.3
> Outgoing interface list:
> FastEthernet0/0, Forward/Sparse, 00:28:06/00:02:20
>
> (10.1.12.1, 224.1.1.1), 00:02:19/00:00:40, flags: LJ
>
> Incoming interface: Null, RPF nbr 0.0.0.0
> Outgoing interface list:
> FastEthernet0/1, Forward/Sparse, 00:02:19/00:02:26
> FastEthernet0/0, Forward/Sparse, 00:02:19/00:02:20
>
>
> Here is my configs from R2, R3 and R4
>
> R2:
>
> interface Loopback0
> ip address 2.2.2.2 255.0.0.0
> ip pim sparse-mode
> !
>
> interface FastEthernet0/0
> ip address 10.1.12.2 255.255.255.0
> ip pim sparse-mode
> ip multicast helper-map broadcast 224.1.1.1 100 ttl 5
> duplex auto
> speed auto
>
> !
> interface FastEthernet0/1
> ip address 10.1.23.2 255.255.255.0
> ip pim sparse-mode
> duplex auto
> speed auto
> !
> router ospf 100
> log-adjacency-changes
>
> network 2.2.2.2 0.0.0.0 area 0
> network 10.1.23.2 0.0.0.0 area 0
> !
> ip forward-protocol nd
> ip forward-protocol udp rip
> !
> !
> ip http server
> no ip http secure-server
>
> ip pim bsr-candidate Loopback0 0
> ip pim rp-candidate Loopback0
> !
> access-list 100 permit udp any any eq rip
> access-list 100 permit udp any any eq domain
>
> R3:
>
>
> interface Loopback0
> ip address 3.3.3.3 255.0.0.0
>
> !
> interface FastEthernet0/0
> ip address 10.1.23.3 255.255.255.0
> ip pim sparse-mode
> duplex auto
> speed auto
>
> !
> interface FastEthernet0/1
> ip address 10.1.34.3 255.255.255.0
> ip pim sparse-mode
> duplex auto
> speed auto
> !
> router ospf 100
> log-adjacency-changes
>
> network 0.0.0.0 255.255.255.255 area 0
>
> R4:
>
> interface Loopback0
> ip address 4.4.4.4 255.0.0.0
> ip pim sparse-mode
> !
>
> interface FastEthernet0/0
> ip address 10.1.45.4 255.255.255.0
> ip directed-broadcast
> ip pim sparse-mode
> duplex auto
> speed auto
>
> !
> interface FastEthernet0/1
> ip address 10.1.34.4 255.255.255.0
> ip pim sparse-mode
> ip multicast helper-map 224.1.1.1 10.1.45.255 100
> duplex auto
> speed auto
> !
> router ospf 100
> log-adjacency-changes
>
> network 4.4.4.4 0.0.0.0 area 0
> network 10.1.34.4 0.0.0.0 area 0
> !
> ip forward-protocol nd
> ip forward-protocol udp rip
> !
> !
> ip http server
> no ip http secure-server
>
> !
> access-list 100 permit udp any any eq rip
> access-list 100 permit udp any any eq domain
>
>
>
> On Fri, Nov 20, 2009 at 10:56 AM, ALL From_NJ <all.from.nj_at_gmail.com>wrote:
>
>> I have to run out in 2 minutes, but can add more color later.
>>
>> Nate - can you try this with DNS and then paste your configs if it does
>> not work?
>>
>> I labbed this and got DNS lookups to work fairly easily, but did not get
>> RIP to be forwarded. I need a little more time to look at RIP, however dns
>> bcasts on one side are forwarded across to the other ... I am trying to
>> squeeze this lab test in between a mountain of other end of week tasks. ;-)
>>
>>
>> Not to be silly with this next suggestion Nate, however ... when
>> forwarding the DNS, make sure that the correct port numbers are specified in
>> the forward-protocol command and the access-list. I originally copied and
>> pasted the command reference into notepad and forgot to change these. Oh
>> well ... trying to be too quick.
>>
>> Also, a pretty cool thing to do across the network before and during the
>> test is the show ip mroute command. You will see incoming and outgoing
>> interfaces added accordingly. Keep it nerdy!
>>
>> Team ---> TGIF!
>>
>> Chat soon,
>>
>> Andrew
>>
>>
>> On Fri, Nov 20, 2009 at 4:33 AM, Roy Waterman <roy.waterman_at_gmail.com>wrote:
>>
>>> Hi Nate
>>>
>>> It looks like you are missing:
>>>
>>> *ip pim sparse-mode* on R2 f0/0.
>>>
>>> This command does show on the config guide.
>>> With all the commands needed for mcast helper map, it is so easy to miss
>>> the
>>> odd command.
>>> Other than that, your config looks great to me.
>>>
>>> Give that a go and let us know if that resolves matters.
>>>
>>> Regards
>>> Roy
>>>
>>> 2009/11/14 Nate Lee <natetlee_at_gmail.com>
>>>
>>> > I am having an issue getting the ip helper-map to work and after going
>>> over
>>> > my configs 3 or 4 times am still not sure what the problem is. Any
>>> hints
>>> > or
>>> > pointers in the right direction would be greatly appreciated. I am
>>> trying
>>> > to get one router to send a RIPv2 broadcast which should be picked up
>>> by
>>> > another router, translated using the multicast helper-map to 224.1.1.1
>>> and
>>> > then sent across an OSPF domain where it is converted back to a
>>> broadcast
>>> > at
>>> > the other side and received by another RIP router.
>>> >
>>> > *The setup:*
>>> >
>>> > I have 5 routers setup in a straight line R1 <> R2 <> R3 <> R4 <> R5.
>>> > Multicast routing is enabled on R2, R3 and R4.
>>> >
>>> > R2, R3 and R4 are all running PIM sparse mode on their loopbacks and
>>> their
>>> > interfaces facing each other.
>>> >
>>> > R1 and R5 are speaking RIPv2 and R2, R3 and R4 are using OSPF. I am
>>> trying
>>> > to get R5 to receive RIP routes from R1.
>>> >
>>> > R1 has the v2-broadcast turned on on its interface facing R2. R2 is
>>> able
>>> > to
>>> > see these broadcasts with a packet debug.
>>> >
>>> > R2 is the BSR and RP for the three routers running OSPF, multicast
>>> routing
>>> > is not enabled on R1 or R5.
>>> >
>>> > The helper map is configured on R2's interface fa0/0 which is facing R1
>>> and
>>> > should take RIP broadcasts and convert them to the 224.1.1.1 group.
>>> >
>>> > There is another helper-map on R4's fa0/1 interface which faces R3 and
>>> is
>>> > configured to receive the 224.1.1.1 group and send a broadcast to
>>> > 10.1.45.255.
>>> >
>>> > IP Directed-broadcast is enabled on R4's fa0/0 interface facing R5.
>>> >
>>> > R5 is configured with no validate-update-source to prevent it from
>>> dropping
>>> > any packets that appear from R1's 10.1.12.1 address.
>>> >
>>> > *The problem:*
>>> >
>>> > When I debug IP mpacket and debug IP packet on R2, I am able to see the
>>> RIP
>>> > broadcasts from R1, but it appears that they are never sent out as the
>>> > 224.1.1.1 multicast address
>>> >
>>> > R5 never receives any packets from R1, a debug IP mpacket on R2 R3 and
>>> R4
>>> > show no packets to 224.1.1.1 ever being sent anywhere.
>>> >
>>> > *The configs:
>>> > *
>>> > R1:
>>> >
>>> > interface FastEthernet0/0
>>> > ip address 10.1.12.1 255.255.255.0
>>> > ip rip v2-broadcast
>>> >
>>> > router rip
>>> > version 2
>>> > network 1.0.0.0
>>> > network 10.0.0.0
>>> > no auto-summary
>>> >
>>> > R2:
>>> >
>>> > interface FastEthernet0/0
>>> > ip address 10.1.12.2 255.255.255.0
>>> > ip multicast helper-map broadcast 224.1.1.1 100 ttl 4
>>> > !
>>> > interface FastEthernet0/1
>>> > ip address 10.1.23.2 255.255.255.0
>>> > ip pim sparse-mode
>>> > !
>>> > router ospf 100
>>> > network 2.2.2.2 0.0.0.0 area 0
>>> > network 10.1.23.2 0.0.0.0 area 0
>>> > !
>>> > ip forward-protocol udp rip
>>> > !
>>> > ip pim bsr-candidate Loopback0 0
>>> > ip pim rp-candidate Loopback0
>>> > !
>>> > access-list 100 permit udp any any eq rip
>>> >
>>> > R3:
>>> >
>>> > interface FastEthernet0/0
>>> > ip address 10.1.23.3 255.255.255.0
>>> > ip pim sparse-mode
>>> > !
>>> > interface FastEthernet0/1
>>> > ip address 10.1.34.3 255.255.255.0
>>> > ip pim sparse-mode
>>> > !
>>> > router ospf 100
>>> > network 0.0.0.0 255.255.255.255 area 0
>>> >
>>> > R4:
>>> >
>>> > interface FastEthernet0/0
>>> > ip address 10.1.45.4 255.255.255.0
>>> > ip directed-broadcast
>>> > ip igmp join-group 224.1.1.1
>>> > !
>>> > interface FastEthernet0/1
>>> > ip address 10.1.34.4 255.255.255.0
>>> > ip pim sparse-mode
>>> > ip multicast helper-map 224.1.1.1 10.1.45.255 100
>>> > !
>>> > router ospf 100
>>> > network 4.4.4.4 0.0.0.0 area 0
>>> > network 10.1.34.4 0.0.0.0 area 0
>>> > !
>>> > ip forward-protocol nd
>>> > ip forward-protocol udp rip
>>> >
>>> > R5:
>>> >
>>> > interface FastEthernet0/0
>>> > ip address 10.1.45.5 255.255.255.0
>>> > !
>>> > router rip
>>> > version 2
>>> > no validate-update-source
>>> > network 10.0.0.0
>>> > no auto-summary
>>> >
>>> > *The shows and debugs:
>>> >
>>> > *
>>> > From R2 with debug ip packet and mpacket enabled, notice no packets to
>>> > 224.1.1.1 are ever sent:
>>> >
>>> > *Mar 1 01:29:53.599: IP: s=10.1.12.1 (FastEthernet0/0),
>>> d=255.255.255.255,
>>> > len 52, rcvd 2
>>> > *Mar 1 01:29:53.603: UDP src=520, dst=520
>>> >
>>> > From R4:
>>> >
>>> > R4(config-if)#*do sh ip mroute*
>>> >
>>> > IP Multicast Routing Table
>>> > <output omitted>
>>> >
>>> > (*, 224.1.1.1), 01:21:43/00:02:57, RP 2.2.2.2, flags: SJCL
>>> > Incoming interface: FastEthernet0/1, RPF nbr 10.1.34.3
>>> > Outgoing interface list:
>>> > FastEthernet0/0, Forward/Sparse, 00:41:58/00:02:54
>>> >
>>> > (*, 224.0.1.40), 01:24:27/00:02:52, RP 0.0.0.0, flags: DCL
>>> > Incoming interface: Null, RPF nbr 0.0.0.0
>>> > Outgoing interface list:
>>> > Loopback0, Forward/Sparse, 01:24:27/00:02:52
>>> >
>>> >
>>> > R4(config-if)#*do sh ip pim rp map 224.1.1.1*
>>> >
>>> > PIM Group-to-RP Mappings
>>> >
>>> > Group(s) 224.0.0.0/4
>>> > RP 2.2.2.2 (?), v2
>>> > Info source: 2.2.2.2 (?), via bootstrap, priority 0, holdtime 150
>>> > Uptime: 01:24:07, expires: 00:01:48
>>> >
>>> >
>>> > Blogs and organic groups at http://www.ccie.net
>>> >
>>> > _______________________________________________________________________
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>>> > http://www.groupstudy.com/list/CCIELab.html
>>> >
>>> >
>>> >
>>> >
>>> >
>>> >
>>> >
>>> >
>>>
>>>
>>> --
>>> Regards
>>> Roy
>>>
>>>
>>> Blogs and organic groups at http://www.ccie.net
>>>
>>> _______________________________________________________________________
>>> Subscription information may be found at:
>>> http://www.groupstudy.com/list/CCIELab.html
>>>
>>>
>>>
>>>
>>>
>>>
>>>
>>>
>>
>>
>> --
>> Andrew Lee Lissitz
>> all.from.nj_at_gmail.com
>>
>
>

-- 
Regards
Roy
Blogs and organic groups at http://www.ccie.net