From: Henk de Tombe (henk.de.tombe@qi.nl)
Date: Sun Jan 22 2006 - 07:55:42 GMT-3
Hi Group,
I would appreciate your help with the following:
R1 learns the network 172.16.234.0/24 via 172.16.234.3 and 172.16.234.4. My
question is about changing the RPF neighbor for a specific S,G entry. See my
configuration steps below and the problem I face.
conf t
Enter configuration commands, one per line. End with CNTL/Z.
Rack1R1(config)#
Rack1R1(config)#s do sir
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, 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
172.16.0.0/16 is variably subnetted, 7 subnets, 2 masks
O E2 172.16.234.0/24 [110/20] via 172.16.123.4, 00:11:54, Serial0/0
<--------
[110/20] via 172.16.123.3, 00:11:54, Serial0/0
<--------
C 172.16.40.0/24 is directly connected, FastEthernet0/0
C 172.16.30.0/24 is directly connected, Loopback0
O E2 172.16.10.0/24 [110/20] via 172.16.123.4, 00:11:54, Serial0/0
[110/20] via 172.16.123.3, 00:11:54, Serial0/0
O 172.16.123.4/32 [110/64] via 172.16.123.4, 00:11:54, Serial0/0
O 172.16.123.3/32 [110/64] via 172.16.123.3, 00:11:55, Serial0/0
C 172.16.123.0/24 is directly connected, Serial0/0
150.1.0.0/24 is subnetted, 1 subnets
O E2 150.1.8.0 [110/20] via 172.16.40.7, 00:11:55, FastEthernet0/0
Router R4 is on subnet 172.16.234.0/24 and would like to join multicastgroup
224.111.111.111 on a router behind R1's fastethernetinterface. As you can
see in the mroute table below 172.16.234.4/32 is registered as source via
RPF neighbor 172.16.234.4.
Everything works fine and I can send ICMP packets to group 224.111.111.111
Rack1R1(config)#do sim 224.111.111.111
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
Timers: Uptime/Expires
Interface state: Interface, Next-Hop or VCD, State/Mode
(*, 224.111.111.111), 00:03:23/stopped, RP 150.1.8.8, flags: SP
Incoming interface: FastEthernet0/0, RPF nbr 172.16.40.7
Outgoing interface list: Null
(172.16.10.4, 224.111.111.111), 00:03:23/00:00:29, flags: T
Incoming interface: Serial0/0, RPF nbr 172.16.123.4
Outgoing interface list:
FastEthernet0/0, Forward/Sparse, 00:03:23/00:03:07
(172.16.234.4, 224.111.111.111), 00:03:23/00:00:29, flags: T
Incoming interface: Serial0/0, RPF nbr 172.16.123.4 <----------
Outgoing interface list:
FastEthernet0/0, Forward/Sparse, 00:03:24/00:03:05
I would like to change the RPF interface to 172.16.234.3 for S,G
(172.16.234.4, 224.111.111.111).
I've tried to do this with the command "ip route"
Rack1R1(config)#ip route 172.16.234.4 255.255.255.255 172.16.123.3
Rack1R1(config)#
Rack1R1(config)#
Rack1R1(config)#do sim 224.111.111.111
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
Timers: Uptime/Expires
Interface state: Interface, Next-Hop or VCD, State/Mode
(*, 224.111.111.111), 00:03:38/stopped, RP 150.1.8.8, flags: SP
Incoming interface: FastEthernet0/0, RPF nbr 172.16.40.7
Outgoing interface list: Null
(172.16.10.4, 224.111.111.111), 00:03:38/00:00:14, flags: T
Incoming interface: Serial0/0, RPF nbr 172.16.123.4
Outgoing interface list:
FastEthernet0/0, Forward/Sparse, 00:03:38/00:02:51
(172.16.234.4, 224.111.111.111), 00:03:38/00:00:14, flags: T
Incoming interface: Serial0/0, RPF nbr 172.16.123.3 <------------
Outgoing interface list:
FastEthernet0/0, Forward/Sparse, 00:03:39/00:02:50
The RPF nbr is changed to 172.16.123.3. When I delete the static route the
RPF nbr for that S,G entry is 172.16.123.4 again.
Rack1R1(config)#no ip route 172.16.234.4 255.255.255.255 172.16.123.3
Rack1R1(config)#
Rack1R1(config)#
Rack1R1(config)#do sim 224.111.111.111
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
Timers: Uptime/Expires
Interface state: Interface, Next-Hop or VCD, State/Mode
(*, 224.111.111.111), 00:16:40/stopped, RP 150.1.8.8, flags: SP
Incoming interface: FastEthernet0/0, RPF nbr 172.16.40.7
Outgoing interface list: Null
(172.16.10.4, 224.111.111.111), 00:02:08/00:03:19, flags: T
Incoming interface: Serial0/0, RPF nbr 172.16.123.4
Outgoing interface list:
FastEthernet0/0, Forward/Sparse, 00:02:08/00:02:50
(172.16.234.4, 224.111.111.111), 00:02:08/00:03:19, flags: T
Incoming interface: Serial0/0, RPF nbr 172.16.123.4 <----------
Outgoing interface list:
FastEthernet0/0, Forward/Sparse, 00:02:09/00:02:49
When I try to do the same with a mroute entry, the RPF nbr doesn't change,
see the output below.
Rack1R1(config)#ip route mroute 172.16.234.4 255.255.255.255 172.16.123.3
Rack1R1(config)#
Rack1R1(config)#
Rack1R1(config)#do sh ip mroute static
Mroute: 172.16.234.4/32, RPF neighbor: 172.16.123.3
Protocol: none, distance: 0, route-map: none
Rack1R1(config)#
Rack1R1(config)#
Rack1R1(config)#do sim 224.111.111.111
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
Timers: Uptime/Expires
Interface state: Interface, Next-Hop or VCD, State/Mode
(*, 224.111.111.111), 00:04:35/stopped, RP 150.1.8.8, flags: SP
Incoming interface: FastEthernet0/0, RPF nbr 172.16.40.7
Outgoing interface list: Null
(172.16.10.4, 224.111.111.111), 00:00:26/00:03:25, flags: T
Incoming interface: Serial0/0, RPF nbr 172.16.123.4
Outgoing interface list:
FastEthernet0/0, Forward/Sparse, 00:00:26/00:03:03
(172.16.234.4, 224.111.111.111), 00:00:26/00:03:25, flags: T
Incoming interface: Serial0/0, RPF nbr 172.16.123.4 <------------ ?????
Outgoing interface list:
FastEthernet0/0, Forward/Sparse, 00:00:27/00:03:02
I don't understand why the RPF neighbor doesn't change when I use mroute,
but does change when I use the route command. The only thing I can imagine
is that the load-balancing in the RIB is causing me troubles. Who can give
me some tips or push me to the right direction on this one?
Thanks for your time,
Regards,
Henk
P.s. config and output below for extra clarity
Rack1R1(config)#do sh ver | i IO
IOS (tm) C2600 Software (C2600-IK9O3S3-M), Version 12.2(15)T17, RELEASE
SOFTWARE (fc1)
Rack1R1(config)#do sr int s0/0
Building configuration...
Current configuration : 294 bytes
!
interface Serial0/0
ip address 172.16.123.1 255.255.255.0
ip pim nbma-mode
ip pim sparse-mode
encapsulation frame-relay
no ip route-cache
ip ospf network point-to-multipoint
no ip mroute-cache
no frame-relay inverse-arp IP 104
no frame-relay inverse-arp IP 105
no frame-relay inverse-arp IP 113
end
Rack1R1(config)#do term len 0
Rack1R1(config)#do sr
Building configuration...
Current configuration : 2179 bytes
!
version 12.2
service timestamps debug datetime msec
service timestamps log datetime msec
no service password-encryption
!
hostname Rack1R1
!
logging queue-limit 100
logging buffered 32768 debugging
!
memory-size iomem 10
ip subnet-zero
!
!
no ip domain lookup
!
ip multicast-routing
ip audit notify log
ip audit po max-events 100
!
!
!
!
!
!
!
!
!
!
!
!
no voice hpi capture buffer
no voice hpi capture destination
!
!
mta receive maximum-recipients 0
!
!
!
!
interface Loopback0
ip address 172.16.30.1 255.255.255.0
ip pim sparse-mode
no ip route-cache
ip ospf network point-to-point
no ip mroute-cache
!
interface FastEthernet0/0
ip address 172.16.40.1 255.255.255.0
ip pim sparse-mode
no ip route-cache
no ip mroute-cache
duplex auto
speed auto
!
interface Serial0/0
ip address 172.16.123.1 255.255.255.0
ip pim sparse-mode
encapsulation frame-relay
no ip route-cache
ip ospf network point-to-multipoint
no ip mroute-cache
no frame-relay inverse-arp IP 104
no frame-relay inverse-arp IP 105
no frame-relay inverse-arp IP 113
!
interface FastEthernet0/1
no ip address
shutdown
duplex auto
speed auto
!
interface Serial0/1
no ip address
shutdown
!
router ospf 1
router-id 172.16.40.1
log-adjacency-changes
redistribute connected subnets
network 172.16.40.1 0.0.0.0 area 0
network 172.16.123.1 0.0.0.0 area 0
distribute-list 99 out connected
!
ip http server
no ip http secure-server
ip classless
!
ip pim rp-address 150.1.8.8
ip mroute 0.0.0.0 0.0.0.0 172.16.123.3
!
!
access-list 99 permit 172.16.0.0 0.0.62.0
!
call rsvp-sync
!
!
mgcp profile default
!
dial-peer cor custom
!
!
!
!
alias exec sir show ip route
alias exec siib show ip interface brief
alias exec sip show ip protocol
alias exec ct configure terminal
alias exec sr show running-config
alias exec cibs clear ip bgp * soft
alias exec cim clear ip mroute *
alias exec bbgp show run | begin router bgp
alias exec bospf show run | begin router ospf
alias exec beigrp show run | begin router eigrp
alias exec brip show run | begin router rip
alias exec son show ip ospf neigh
alias exec sim show ip mroute
!
line con 0
logging synchronous
line aux 0
line vty 0 4
login
!
!
end
Rack1R1(config)#do sh frame map
Serial0/0 (up): ip 172.16.123.3 dlci 103(0x67,0x1870), dynamic,
broadcast,, status defined, active
Serial0/0 (up): ip 172.16.123.4 dlci 102(0x66,0x1860), dynamic,
broadcast,, status defined, active
Rack1R1(config)#
Rack1R1(config)#
Rack1R1(config)# Rack1R1(config)#do sh frame pvc | I DLCI
DLCI = 102, DLCI USAGE = LOCAL, PVC STATUS = ACTIVE, INTERFACE = Serial0/0
DLCI = 103, DLCI USAGE = LOCAL, PVC STATUS = ACTIVE, INTERFACE = Serial0/0
DLCI = 104, DLCI USAGE = LOCAL, PVC STATUS = INACTIVE, INTERFACE = Serial0/0
DLCI = 105, DLCI USAGE = LOCAL, PVC STATUS = ACTIVE, INTERFACE = Serial0/0
DLCI = 113, DLCI USAGE = LOCAL, PVC STATUS = INACTIVE, INTERFACE = Serial0/0
Rack1R1(config)#
Rack1R1(config)#
Rack1R1(config)#do sir
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, 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
172.16.0.0/16 is variably subnetted, 7 subnets, 2 masks
O E2 172.16.234.0/24 [110/20] via 172.16.123.4, 00:14:12, Serial0/0
[110/20] via 172.16.123.3, 00:14:12, Serial0/0
C 172.16.40.0/24 is directly connected, FastEthernet0/0
C 172.16.30.0/24 is directly connected, Loopback0
O E2 172.16.10.0/24 [110/20] via 172.16.123.4, 00:14:12, Serial0/0
[110/20] via 172.16.123.3, 00:14:12, Serial0/0
O 172.16.123.4/32 [110/64] via 172.16.123.4, 00:14:12, Serial0/0
O 172.16.123.3/32 [110/64] via 172.16.123.3, 00:14:14, Serial0/0
C 172.16.123.0/24 is directly connected, Serial0/0
150.1.0.0/24 is subnetted, 1 subnets
O E2 150.1.8.0 [110/20] via 172.16.40.7, 00:14:14, FastEthernet0/0
Rack1R1(config)#
Rack1R1(config)#
Rack1R1(config)#
Rack1R1(config)#do sh ip ospf data
OSPF Router with ID (172.16.40.1) (Process ID 1)
Router Link States (Area 0)
Link ID ADV Router Age Seq# Checksum Link count
150.1.8.8 150.1.8.8 831 0x80000125 0x0012D2 1
172.16.40.1 172.16.40.1 872 0x80000003 0x00D60E 4
172.16.234.2 172.16.234.2 872 0x8000000D 0x00D153 2
172.16.234.3 172.16.234.3 872 0x8000000C 0x009F86 2
Net Link States (Area 0)
Link ID ADV Router Age Seq# Checksum
172.16.40.7 150.1.8.8 892 0x80000001 0x0061B7
Type-5 AS External Link States
Link ID ADV Router Age Seq# Checksum Tag
150.1.8.0 150.1.8.8 1340 0x80000103 0x001B3B 0
172.16.10.0 172.16.234.2 701 0x80000009 0x00339A 90
172.16.10.0 172.16.234.3 1783 0x80000001 0x003D97 90
172.16.30.0 172.16.40.1 903 0x80000001 0x00657A 0
172.16.234.0 172.16.234.2 701 0x80000008 0x008B62 90
172.16.234.0 172.16.234.3 807 0x80000007 0x008766 90
Rack1R1(config)#
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