From: Brian McGahan (bmcgahan@internetworkexpert.com)
Date: Wed Oct 12 2005 - 16:13:34 GMT-3
Ashok,
Try it with other arbitrary UDP traffic and use IP SLA (AKA
SAA/RTR) to generate UDP echoes. The problem with using RIP is the TTL.
HTH,
Brian McGahan, CCIE #8593
bmcgahan@internetworkexpert.com
Internetwork Expert, Inc.
http://www.InternetworkExpert.com
Toll Free: 877-224-8987 x 705
Outside US: 775-826-4344 x 705
24/7 Support: http://forum.internetworkexpert.com
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> -----Original Message-----
> From: nobody@groupstudy.com [mailto:nobody@groupstudy.com] On Behalf
Of
> Ashok M A
> Sent: Wednesday, October 12, 2005 11:16 AM
> To: CCIELab@groupstudy.com; bmcgahan@internetworkexpert.com
> Subject: RE: Multicast helper map seems to work, but doesn't actually
> forward mpacket to next hop router
>
> Hi,
>
> I tried to create this scenario. I could see the
> multicast packet at R2 e0/0 interface being received
> as 224.9.9.9 with source/dest port as 520. But looks
> like this is not forwarded to beyond R2 e1 interface
> which is connected to BB1 over e0. What might be the
> issue?
>
> Config is as follows:
>
> R2#sri e0/0
> Building configuration...
>
> !
> interface e0/0
> ip address 10.1.1.5 255.255.255.0
> ip broadcast-address 20.1.1.0
> ip directed-broadcast
> ip pim sparse-dense-mode
> ip multicast helper-map 224.5.5.5 20.1.1.0 100
> no ip mroute-cache
> end
>
> ip forward-protocol udp rip
> R2#
>
> R2#sri e1
> Building configuration...
>
> interface Ethernet1
> ip address 20.1.1.5 255.255.255.0
> ip directed-broadcast
> ip pim sparse-dense-mode
> no ip route-cache
> no ip mroute-cache
> end
>
> R2#
>
> R2#al 100
> Extended IP access list 100
> permit udp any any eq rip (103 matches)
> R2#
>
>
> Thanks & Regards,
>
> Ashok
>
>
> -----Original Message-----
> From: nobody@groupstudy.com
> [mailto:nobody@groupstudy.com] On Behalf Of Edwards,
> Andrew M
> Sent: Friday, November 12, 2004 11:28 PM
> To: Brian McGahan; CCIELab@groupstudy.com
> Subject: RE: Multicast helper map seems to work, but
> doesn't actually forward mpacket to next hop router
>
> You know I thought it might be a TTL issue with R4 and
> I did look into it by doing this...
>
> Ip multicast helper-map broadcast 224.9.9.9 100 ttl 5
>
> Now, my thoughts are that I have technically, stripped
> and replaced the layer 3 header when I do the
> helper-map unlike a tunnel mode where its
> reencapsulating the entire layer 3 packet. This would
> mean that the helper-map should replace the TTL in the
> RIP broadcast when it recreates the L3 header.
>
> However, the output to R2 was still the same mroute...
> It didn't get the multicastpacket. I even did a
> straight debug with debug ip packet and no conditions.
> I did not see the packet being forwarded when debug
> ip mpacket said it was mforwarded.
>
> Maybe a bug or did I set it up incorrectly?
>
> If you are familiar with the Cisco Press R&S lab book,
> they gave an example of turning rip broadcast into
> multicast and sending to another router on a different
> lan segment. I was simply trying to recreate that
> scenario and viola... It didn't work. 8)
>
> Andy
>
> -----Original Message-----
> From: Brian McGahan
> [mailto:bmcgahan@internetworkexpert.com]
> Sent: Thursday, November 11, 2004 12:23 PM
> To: Edwards, Andrew M; CCIELab@groupstudy.com
> Subject: RE: Multicast helper map seems to work, but
> doesn't actually forward mpacket to next hop router
>
>
> Andy,
>
> IIRC RIP packets have a TTL of 1. This may be the
> problem
> you're seeing. Try generating UDP traffic by using
> the SAA (rtr command
> on the router). I'll take a look at this today and
> let you know what I
> find, but I'd bet that it relates to the TTL.
>
> HTH,
>
> Brian McGahan, CCIE #8593
> bmcgahan@internetworkexpert.com
>
> Internetwork Expert, Inc.
> http://www.InternetworkExpert.com
> Toll Free: 877-224-8987 x 705
> Outside US: 775-826-4344 x 705
> 24/7 Support: http://forum.internetworkexpert.com
> Live Chat: http://www.internetworkexpert.com/chat/
>
> > -----Original Message-----
> > From: nobody@groupstudy.com
> [mailto:nobody@groupstudy.com] On Behalf
> Of
> > Edwards, Andrew M
> > Sent: Thursday, November 11, 2004 11:07 AM
> > To: CCIELab@groupstudy.com
> > Subject: Multicast helper map seems to work, but
> doesn't actually
> forward
> > mpacket to next hop router
> >
> > Well, as is usual for most people, time is running
> short to study for
> my
> > next lab attempt and I ran into a very specific
> problem while digging
> > into multicast...
> >
> > Normally I wont post so much output cause its hard
> to dig through, but
>
> > this one really bothers me. If you have time,
> please read on.
> >
> > Basically, multicast helper map is working and
> forwarding multicast
> > packets, but they are not actually being sent out
> the interface (e.g.
> > neighbor doensn't get the (*,G) entry because no
> packets are being
> > received).
> >
> > R4 is getting RIP broadcasts. R4 has Mroute for the
> helper map. R4
> > debug ip mpacket shows mforward on the helper mapped
> packet. But, R2
> is
> > NOT getting the packet???
> >
> > If you have a minute to look this over I could use
> some insight... thx
> >
> > ---------
> >
> > Setup: Basic setup with of RIP broadcast version 1
> packets multicast
> > helper mapped in dense mode flood.
> >
> > CAT2------- e1/0--- R4 ----e0/0 --------e0/0---R2
> >
> > And, R4 and R2 are with cross over cable (removed
> potential for
> catalyst
> > to be involved)
> >
> > show run
> > Building configuration...
> >
> > Current configuration : 2439 bytes
> > !
> > version 12.3
> > service timestamps debug datetime
> > service timestamps log datetime
> > no service password-encryption
> > !
> > hostname R2
> > !
> > boot-start-marker
> > boot-end-marker
> > !
> > logging buffered 4096 debugging
> > enable secret 5 $1$z12f$r8O3R5b.Z54IQ4kAYt4zB1
> > !
> > clock timezone PST -8
> > clock summer-time DST recurring
> > no aaa new-model
> > ip subnet-zero
> > !
> > !
> > no ip domain lookup
> > ip multicast-routing
> > ip cef
> > !
> > !
> > !
> > !
> > !
> > !
> > !
> > !
> > !
> > !
> > !
> > !
> > !
> > !
> > !
> > interface Loopback0
> > ip address 140.40.102.1 255.255.255.0
> > no clns route-cache
> > !
> > interface Ethernet0/0
> > bandwidth 10000
> > ip address 140.40.40.2 255.255.255.0
> > ip pim dense-mode
> > half-duplex
> > no clns route-cache
> > !
> > interface Serial0/0
> > no ip address
> > encapsulation frame-relay
> > no arp frame-relay
> > no clns route-cache
> > no frame-relay inverse-arp
> > !
> > interface Serial0/0.234 point-to-point
> > ip address 140.40.234.2 255.255.255.240
> > ip pim dense-mode
> > ip ospf network broadcast
> > ip ospf priority 0
> > frame-relay interface-dlci 201
> > !
> > interface TokenRing0/0
> > no ip address
> > shutdown
> > ring-speed 16
> > no clns route-cache
> > !
> > interface Serial0/1
> > no ip address
> > shutdown
> > no clns route-cache
> > !
> > interface BRI1/0
> > no ip address
> > shutdown
> > no clns route-cache
> > !
> > interface Ethernet1/0
> > no ip address
> > shutdown
> > half-duplex
> > no clns route-cache
> > !
> > router eigrp 100
> > redistribute ospf 1 metric 10000 1 255 1 1500
> passive-interface
> > default no passive-interface Ethernet0/0
> > network 140.40.40.0 0.0.0.255
> > network 140.40.102.0 0.0.0.255
> > default-metric 64 1 255 1 1500
> > no auto-summary
> > !
> > router ospf 1
> > router-id 2.2.2.2
> > log-adjacency-changes
> > redistribute eigrp 100 metric 200 metric-type 1
> subnets
> > network 140.40.234.2 0.0.0.0 area 0
> > default-metric 2000
> > distance ospf external 180
> > !
> > router bgp 100
> > no synchronization
> > bgp router-id 2.2.2.2
> > bgp log-neighbor-changes
> > neighbor 140.40.103.1 remote-as 100
> > neighbor 140.40.103.1 update-source Loopback0
> > neighbor 140.40.105.1 remote-as 500
> > neighbor 140.40.105.1 ebgp-multihop 255
> > neighbor 140.40.105.1 update-source Loopback0
> > neighbor 140.40.105.1 send-community
> > neighbor 140.40.105.1 route-map set_comm_to_R5 out
> > no auto-summary
> > !
> > ip http server
> > ip classless
> > !
> > ip bgp-community new-format
> > !
> > access-list 4 permit 128.128.0.0 0.0.127.255
> > !
> > route-map set_comm_to_R5 permit 10
> > match ip address 4
> > set community 100:120 additive
> > !
> > route-map set_comm_to_R5 permit 20
> > !
> > !
> > !
> > !
> > !
> > !
> > line con 0
> > exec-timeout 0 0
> > logging synchronous
> > line aux 0
> > line vty 0 4
> > password cisco
> > login
> > !
> > !
> > end
> >
> >
> > R2#show ip mroute
> > IP Multicast Routing Table
> > Flags: D - Dense, S - Sparse, B - Bidir Group, s -
> SSM Group, C -
> > Connected,
> > L - Local, P - Pruned, R - RP-bit set, F -
> Register flag,
> > T - SPT-bit set, J - Join SPT, M - MSDP
> created entry,
> > X - Proxy Join Timer Running, A - Candidate
> for MSDP
> > Advertisement,
> > U - URD, I - Received Source Specific Host
> Report, Z -
> Multicast
> > Tunnel
> > Y - Joined MDT-data group, y - Sending to
> MDT-data group
> > Outgoing interface flags: H - Hardware switched, A -
> Assert winner
> > Timers: Uptime/Expires
> > Interface state: Interface, Next-Hop or VCD,
> State/Mode
> >
> > (*, 224.0.1.40), 00:16:44/00:02:48, RP 0.0.0.0,
> flags: DCL
> > Incoming interface: Null, RPF nbr 0.0.0.0
> > Outgoing interface list:
> > Ethernet0/0, Forward/Dense, 00:01:35/00:00:00
> > Serial0/0.234, Forward/Dense, 00:16:40/00:00:00
> >
> > R2#show ip route
> > Codes: C - connected, S - static, R - RIP, M -
> mobile, B - BGP
> > D - EIGRP, EX - EIGRP external, O - OSPF, IA
> - OSPF inter area
> > N1 - OSPF NSSA external type 1, N2 - OSPF
> NSSA external type 2
> > E1 - OSPF external type 1, E2 - OSPF external
> type 2
> > i - IS-IS, su - IS-IS summary, L1 - IS-IS
> level-1, L2 - IS-IS
> > level-2
> > ia - IS-IS inter area, * - candidate default,
> U - per-user
> static
> > route
> > o - ODR, P - periodic downloaded static route
> >
> > Gateway of last resort is not set
> >
> > D EX 140.12.0.0/16 [170/281856] via 140.40.40.4,
> 00:01:36, Ethernet0/0
> > 140.40.0.0/16 is variably subnetted, 9 subnets,
> 2 masks
> > C 140.40.234.0/28 is directly connected,
> Serial0/0.234
> > C 140.40.40.0/24 is directly connected,
> Ethernet0/0
> > O IA 140.40.20.0/24 [110/65] via 140.40.234.1,
> 00:18:06,
> > Serial0/0.234
> > D EX 140.40.30.0/24 [170/281856] via 140.40.40.4,
> 00:01:36,
> > Ethernet0/0
> > O IA 140.40.101.0/24 [110/65] via 140.40.234.1,
> 00:18:06,
> > Serial0/0.234
> > C 140.40.102.0/24 is directly connected,
> Loopback0
> > O E1 140.40.103.0/24 [180/364] via 140.40.234.3,
> 00:18:07,
> > Serial0/0.234
> > D EX 140.40.104.0/24 [170/281856] via
> 140.40.40.4, 00:01:37,
> > Ethernet0/0
> > O IA 140.40.105.0/24 [110/66] via 140.40.234.1,
> 00:18:07,
> > Serial0/0.234
> > 128.128.0.0/17 is subnetted, 1 subnets
> > D 128.128.0.0 [90/409600] via 140.40.40.4,
> 00:01:37, Ethernet0/0
> > 150.40.0.0/24 is subnetted, 4 subnets
> > B 150.40.30.0 [20/0] via 140.40.105.1,
> 00:18:02
> > B 150.40.31.0 [20/0] via 140.40.105.1,
> 00:18:02
> > B 150.40.28.0 [20/0] via 140.40.105.1,
> 00:18:02
> > B 150.40.29.0 [20/0] via 140.40.105.1,
> 00:18:02
> > R2#
> >
> >
> > ------
> >
> > R4
> > Building configuration...
> >
> > Current configuration : 1927 bytes
> > !
> > version 12.3
> > service timestamps debug datetime
> > service timestamps log datetime
> > no service password-encryption
> > !
> > hostname R4
> > !
> > boot-start-marker
> > boot-end-marker
> > !
> > logging buffered 4096 debugging
> > enable secret 5 $1$mz8n$ZIB80CuUYS7qHBaONkUvy1
> > !
> > clock timezone PST -8
> > clock summer-time DST recurring
> > no aaa new-model
> > ip subnet-zero
> > !
> > !
> > no ip domain lookup
> >
> > ip multicast-routing
> > ip cef
> > !
> > !
> > !
> > !
> > !
> > !
> > !
> > !
> > !
> > !
> > !
> > !
> > !
> > !
> > !
> > interface Loopback0
> > ip address 140.40.104.1 255.255.255.0
> > ip pim dense-mode
> > ip igmp join-group 225.5.5.5
> > no clns route-cache
> > interface Loopback1
> > ip address 128.128.1.1 255.255.128.0
> > no clns route-cache
> > !
> > interface Ethernet0/0
> > ip address 140.40.40.4 255.255.255.0
> > ip directed-broadcast
> > ip pim dr-priority 10
> > ip pim dense-mode
> > half-duplex
> > no clns route-cache
> > !
> > interface Serial0/0
> > no ip address
> > shutdown
> > no clns route-cache
> > !
> > interface TokenRing0/0
> > no ip address
> > shutdown
> > ring-speed 16
> > no clns route-cache
> >
> > interface Ethernet1/0
> > ip address 140.40.30.4 255.255.255.0
> > ip directed-broadcast
> > ip pim dense-mode
> > ip multicast helper-map broadcast 224.9.9.9 100
> > half-duplex
> > no clns route-cache
> > !
> > interface TokenRing1/0
> > no ip address
> > shutdown
> > ring-speed 16
> > no clns route-cache
> > !
> > router eigrp 100
> > redistribute rip metric 10000 1 255 1 1500
> > passive-interface default
> > no passive-interface Ethernet0/0
> > network 128.128.0.0
> > network 140.40.40.0 0.0.0.255
> > default-metric 64 1 255 1 1500
> > no auto-summary
> >
> > router rip
> > redistribute eigrp 100 metric 2
> > passive-interface default
> > no passive-interface Ethernet1/0
> > network 140.40.0.0
> > !
> > no ip http server
> > ip classless
> > ip forward-protocol udp rip
> > !
> > !
> > access-list 100 permit udp any any eq rip
> > access-list 102 permit udp any any log
> > !
> > !
> > !
> > !
> > !
> > !
> > line con 0
> > exec-timeout 0 0
> > logging synchronous
> > line aux 0
> > line vty 0 4
> > password cisco
> > login
> > !
> > !
> > end
> >
> > R4#show ip mroute
> > IP Multicast Routing Table
> > Flags: D - Dense, S - Sparse, B - Bidir Group, s -
> SSM Group, C -
> > Connected,
> > L - Local, P - Pruned, R - RP-bit set, F -
> Register flag,
> > T - SPT-bit set, J - Join SPT, M - MSDP
> created entry,
> > X - Proxy Join Timer Running, A - Candidate
> for MSDP
> > Advertisement,
> > U - URD, I - Received Source Specific Host
> Report, Z -
> Multicast
> > Tunnel
> > Y - Joined MDT-data group, y - Sending to
> MDT-data group
> > Outgoing interface flags: H - Hardware switched, A -
> Assert winner
> > Timers: Uptime/Expires
> > Interface state: Interface, Next-Hop or VCD,
> State/Mode
> >
> > (*, 225.5.5.5), 00:13:57/00:02:34, RP 0.0.0.0,
> flags: DCL
> > Incoming interface: Null, RPF nbr 0.0.0.0
> > Outgoing interface list:
> > Ethernet0/0, Forward/Dense, 00:01:59/00:00:00
> > Loopback0, Forward/Dense, 00:13:57/00:00:00
> >
> > (*, 224.9.9.9), 00:43:42/stopped, RP 0.0.0.0, flags:
> D
> > Incoming interface: Null, RPF nbr 0.0.0.0
> > Outgoing interface list:
> > Ethernet0/0, Forward/Dense, 00:01:59/00:00:00
> >
> > (140.40.30.12, 224.9.9.9), 00:17:05/00:02:31, flags:
> T <-CAT2
> > translation
> > Incoming interface: Ethernet1/0, RPF nbr 0.0.0.0
> > Outgoing interface list:
> > Ethernet0/0, Forward/Dense, 00:02:01/00:00:00
> >
> > (*, 224.0.1.40), 01:24:23/00:02:36, RP 0.0.0.0,
> flags: DCL
> > Incoming interface: Null, RPF nbr 0.0.0.0
> > Outgoing interface list:
> > Ethernet0/0, Forward/Dense, 00:02:01/00:00:00
> > Ethernet1/0, Forward/Dense, 00:02:09/00:00:00
> >
> > R4#show ip route
> > Codes: C - connected, S - static, R - RIP, M -
> mobile, B - BGP
> > D - EIGRP, EX - EIGRP external, O - OSPF, IA
> - OSPF inter area
> > N1 - OSPF NSSA external type 1, N2 - OSPF
> NSSA external type 2
> > E1 - OSPF external type 1, E2 - OSPF external
> type 2
> > i - IS-IS, su - IS-IS summary, L1 - IS-IS
> level-1, L2 - IS-IS
> > level-2
> > ia - IS-IS inter area, * - candidate default,
> U - per-user
> static
> > route
> > o - ODR, P - periodic downloaded static route
> >
> > Gateway of last resort is not set
> >
> > R 140.12.0.0/16 [120/1] via 140.40.30.12,
> 00:00:04, Ethernet1/0
> > 140.40.0.0/16 is variably subnetted, 9 subnets,
> 2 masks
> > D EX 140.40.234.0/28 [170/281856] via
> 140.40.40.2, 00:02:00,
> > Ethernet0/0
> > C 140.40.40.0/24 is directly connected,
> Ethernet0/0
> > D EX 140.40.20.0/24 [170/281856] via 140.40.40.2,
> 00:02:00,
> > Ethernet0/0
> > C 140.40.30.0/24 is directly connected,
> Ethernet1/0
> > D EX 140.40.101.0/24 [170/281856] via
> 140.40.40.2, 00:02:00,
> > Ethernet0/0
> > D 140.40.102.0/24 [90/409600] via 140.40.40.2,
> 00:02:01,
> > Ethernet0/0
> > D EX 140.40.103.0/24 [170/281856] via
> 140.40.40.2, 00:02:01,
> > Ethernet0/0
> > C 140.40.104.0/24 is directly connected,
> Loopback0
> > D EX 140.40.105.0/24 [170/281856] via
> 140.40.40.2, 00:02:01,
> > Ethernet0/0
> > 128.128.0.0/17 is subnetted, 1 subnets
> > C 128.128.0.0 is directly connected, Loopback1
> >
> >
> > R4#debug ip packet 100 det
> > IP packet debugging is on (detailed) for access list
> 100
> > R4#
> > *Mar 1 01:24:59: IP: s=140.40.30.4 (local),
> d=255.255.255.255
> > (Ethernet1/0), len 192, sending broad/multicast
> > *Mar 1 01:24:59: UDP src=520, dst=520
> > R4#
> > *Mar 1 01:25:02: IP: s=140.40.30.12 (Ethernet1/0),
> d=255.255.255.255,
>
> > len 52, rcvd 2
> > *Mar 1 01:25:02: UDP src=520, dst=520
> >
> > R4#un all
> > All possible debugging has been turned off
> >
> > R4#debug ip mpacket
> > IP multicast packets debugging is on
> > R4#
> > *Mar 1 01:25:29: IP(0): s=140.40.30.12
> (Ethernet1/0) d=224.9.9.9
> > (Ethernet0/0) id=0, prot=17, len=52(52), mforward
> >
> > R4#un all
> > All possible debugging has been turned off
> >
> > R4#ping 140.40.40.2
> >
> > Type escape sequence to abort.
> > Sending 5, 100-byte ICMP Echos to 140.40.40.2,
> timeout is 2 seconds:
> > !!!!! Success rate is 100 percent (5/5), round-trip
> min/avg/max =
> > 4/4/4 ms R4#
> >
>
>
>
>
> __________________________________________________________
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>
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