[Xorp-users] Fwd: how to forward a multicast message with pimsm?
Hajnalka Köntös
hkontos@gmail.com
Tue, 8 Nov 2005 12:21:33 +0100
I wish to configure a simple pim-sm network to send my multicast
messages to the remote site. I use the liveCD with xorp. My multicast
messages do not arrive to the remote network. Will you please help me
why, or what should be done on another way?
My test network:
Host1-[net1]-Router1-[net0]-Router2-[net2]-Host2
where
- Router1, Router2: xorp routers, see config below
- Host1, Host2 are hosts on different sites that wish to exchange
multicast datagrams of IP 239.253.0.200.
- net0: 192.168.64.0/24
- net1: 10.7.7.0/24
- net2: 10.6.6.0/24
I have 'mtest' on both Hosts to register them to igmp multicast group
of 239.253.0.200. Then from Host1 I send udp messages to this
multicast address, which is expected to seen on Host2. I tried
bootstrap and static rp setting as well on the routers, but this
traffic does not arrive to Host2 or vice versa.
Tcpdump shows that routers see the 239.253.0.200 multicast traffic
coming in the inside interface (net1|net2), but router does not put
this multicast traffic to its outside inteface on net0.
What am I doing wrong?
Router1 is the RP
Router1: xorpsh -> configure -> show
-------------------------------
interfaces {
interface lnc0 {
description: "lnc0"
disable: false
vif lnc0 {
disable: false
address 10.7.7.1 {
prefix-length: 24
broadcast: 10.7.7.255
disable: false
}
}
discard: false
}
interface lnc1 {
description: "lnc1"
disable: false
vif lnc1 {
disable: false
address 192.168.64.177 {
prefix-length: 24
broadcast: 192.168.64.255
disable: false
}
}
discard: false
}
targetname: "fea"
}
fea {
unicast-forwarding4 {
disable: false
}
targetname: "fea"
}
plumbing {
mfea4 {
disable: false
interface lnc0 {
vif lnc0 {
disable: false
}
}
interface lnc1 {
vif lnc1 {
disable: false
}
}
interface register_vif {
vif register_vif {
disable: false
}
}
traceoptions {
flag {
all {
disable: false
}
}
}
targetname: "MFEA_4"
}
}
protocols {
static {
route4 10.6.6.0/24 {
next-hop: 192.168.64.160
metric: 1
}
mrib-route4 10.6.6.0/24 {
next-hop: 192.168.64.160
metric: 1
}
targetname: "static_routes"
disable: true
}
igmp {
disable: false
interface lnc0 {
vif lnc0 {
disable: false
}
}
interface lnc1 {
vif lnc1 {
disable: false
}
}
traceoptions {
flag {
all {
disable: false
}
}
}
targetname: "IGMP"
}
pimsm4 {
disable: false
interface lnc0 {
vif lnc0 {
disable: false
dr-priority: 1
}
}
interface lnc1 {
vif lnc1 {
disable: false
dr-priority: 1
}
}
interface register_vif {
vif register_vif {
disable: false
dr-priority: 1
}
}
static-rps {
rp 192.168.64.177 {
group-prefix 224.0.0.0/4 {
rp-priority: 192
hash-mask-len: 30
}
group-prefix 239.253.0.0/24 {
rp-priority: 192
hash-mask-len: 30
}
}
}
switch-to-spt-threshold {
disable: false
interval-sec: 100
bytes: 102400
}
traceoptions {
flag {
all {
disable: false
}
}
}
targetname: "PIMSM_4"
}
fib2mrib {
disable: false
targetname: "fib2mrib"
}
}
----------------------------------------
Router1:
Xorp> show pim interface
Interface State Mode V PIMstate Priority DRaddr Neighbors
lnc0 UP Sparse 2 DR 1 10.7.7.1 0
lnc1 UP Sparse 2 DR 1 192.168.64.177 1
register_vif UP Sparse 2 DR 1 10.7.7.1 0
Xorp> show pim neighbors
Interface DRpriority NeighborAddr V Mode Holdtime Timeout
lnc1 1 192.168.64.160 2 Sparse 105 88
Xorp> show pim rps
RP Type Pri Holdtime Timeout ActiveGroups GroupPrefix
192.168.64.177 static 192 -1 -1 0 224.0.0.0/4
192.168.64.177 static 192 -1 -1 1 239.253.0.0/24
Xorp> show pim mrib
DestPrefix NextHopRouter VifName VifIndex MetricPref Metric
10.6.6.0/24 10.6.6.1 lnc0 0 0 0
10.7.7.0/24 192.168.64.177 lnc1 1 1 1
192.168.64.0/24 192.168.64.160 lnc1 1 0 0
Xorp> show pim join
Group Source RP Flags
Xorp> show pim mfc
Group Source RP
----------------------------------------
Router2:
Xorp> show pim interface
Interface State Mode V PIMstate Priority DRaddr Neighbors
lnc0 UP Sparse 2 DR 1 10.6.6.1 0
lnc1 UP Sparse 2 NotDR 1 192.168.64.177 1
register_vif UP Sparse 2 DR 1 10.6.6.1 0
Xorp> show pim neighbors
Interface DRpriority NeighborAddr V Mode Holdtime Timeout
lnc1 1 192.168.64.177 2 Sparse 105 78
Xorp> show pim rps
RP Type Pri Holdtime Timeout ActiveGroups GroupPrefix
192.168.64.177 static 192 -1 -1 0 224.0.0.0/4
192.168.64.177 static 192 -1 -1 0 239.253.0.0/24
Xorp> show pim mrib
DestPrefix NextHopRouter VifName VifIndex MetricPref Metric
10.6.6.0/24 192.168.64.160 lnc1 1 1 1
10.7.7.0/24 10.7.7.1 lnc0 0 0 0
192.168.64.0/24 192.168.64.177 lnc1 1 0 0
Xorp> show pim join
Group Source RP Flags
Xorp> show pim mfc
Group Source RP
Thank you for any advice.
Hajni