[Xorp-users] Fwd: Second router in a chain does not add mfc entry
Шинкарук Дмитрий
dimashink at gmail.com
Wed Jun 5 02:10:58 PDT 2013
Oh yeah!
Before I set rp_filter flags like this:
echo 0 > /proc/sys/net/ipv4/conf/eth1/rp_filter
and so on for all interfaces.
I've just tried to set flag /proc/sys/net/ipv4/conf/default/rp_filter to 0,
as you suggested, but this didn't help.
Then I set flag /proc/sys/net/ipv4/conf/all/rp_filter to 0, and Receiver
started to receive packets.
Thank you very much!
2013/6/3 Dan Rosenqvist <danro at kth.se>
> Hi,
>
>
>
> Have you checked /proc/sys/net/ipv4/ip_forward is set to 1 and that
> /proc/sys/net/ipv4/conf/default/rp_filter is set to 0 for all interfaces
> and routers?
>
>
>
> I've had some strange behaviour regarding these two (especially the rp
> filter).
>
>
>
> Regards,
>
> Dan
>
> ------------------------------
>
> *Från:* Шинкарук Дмитрий [dimashink at gmail.com]
> *Skickat:* den 3 juni 2013 12:14
> *Till:* Dan Rosenqvist
> *Ämne:* Re: [Xorp-users] Second router in a chain does not add mfc entry
>
> Hi Dan,
> Unicast routing is enabled on all routers, and every router can ping each
> other. This problem occurs even if I ommit xorp_router_1, so Receiver is
> directly connected to xorp_router_2 - no mfc entries are inserted. But
> 'show pim join' shows that everything is OK.
> I am surprised that xorp_router_3 inserts mfc entry and sends packets to
> xorp_router_2 (tcpdump shows that) but they do not go through xorp_router_2.
>
>
>
>
> 2013/6/3 Dan Rosenqvist <danro at kth.se>
>
>> Hi,
>>
>> Is unicast routing activated on your routers and in that case can you
>> provide your uc routing tables?
>>
>> Pim uses the uc routing table to forward mc frames.
>>
>> Regards,
>> Dan
>> ________________________________________
>> Från: xorp-users-bounces at xorp.org [xorp-users-bounces at xorp.org] för
>> Шинкарук Дмитрий [dimashink at gmail.com]
>> Skickat: den 2 juni 2013 22:03
>> Till: xorp-users at xorp.org
>> Ämne: [Xorp-users] Second router in a chain does not add mfc entry
>>
>> Hello,
>> I am trying to make xorp multicast routing work with the following
>> network configuration:
>>
>> Receiver (10.1.2.2) ------ (10.1.2.1) xorp_router_1 (10.1.3.1) -------
>> (10.1.3.2) xorp_router_2 (10.1.4.1) ------- (10.1.4.2) xorp_router_3
>> (10.1.1.1) ------ Sender (10.1.1.2)
>>
>> Sender and receiver use VLC for sending and receiving multicast traffic
>> respectively.
>> Every xorp_router has similar XORP configuration files:
>>
>> interfaces {
>> restore-original-config-on-shutdown: false
>> interface eth2 {
>> disable: false
>> default-system-config
>> }
>> interface eth3 {
>> disable: false
>> default-system-config
>> }
>>
>> }
>>
>> fea {
>> unicast-forwarding4 {
>> disable: true
>> }
>> }
>>
>> plumbing {
>> mfea4 {
>> disable: false
>> interface eth2 {
>> vif eth2 {
>> disable: false
>> }
>> }
>> interface eth3 {
>> vif eth3 {
>> disable: false
>> }
>> }
>> interface register_vif {
>> vif register_vif {
>> /* Note: this vif should be always enabled */
>> disable: false
>> }
>> }
>> traceoptions {
>> flag all {
>> disable: false
>> }
>> }
>> }
>>
>> }
>>
>> protocols {
>> igmp {
>> disable: false
>> interface eth2 {
>> vif eth2 {
>> disable: false
>> }
>> }
>> interface eth3 {
>> vif eth3 {
>> disable: false
>> }
>> }
>> traceoptions {
>> flag all {
>> disable: false
>> }
>> }
>> }
>> }
>>
>> protocols {
>> pimsm4 {
>> disable: false
>> interface eth2 {
>> vif eth2 {
>> disable: false
>> }
>> }
>> interface eth3 {
>> vif eth3 {
>> disable: false
>> }
>> }
>>
>> interface register_vif {
>> vif register_vif {
>> /* Note: this vif should be always enabled */
>> disable: false
>> }
>> }
>>
>> static-rps {
>> rp 10.1.4.2 {
>> group-prefix 224.0.0.0/4<http://224.0.0.0/4> {
>>
>> }
>> }
>> }
>> traceoptions {
>> flag all {
>> disable: false
>> }
>> }
>> }
>>
>> }
>>
>> protocols {
>> fib2mrib {
>> disable: false
>> }
>> }
>>
>> When I start stream sender and receiver I can see following output on
>> routers:
>>
>> For XORP_ROUTER_1
>>
>> root at xorp_router_1> show pim join
>> Group Source RP Flags
>> 230.230.230.1 0.0.0.0 10.1.4.2 WC
>> Upstream interface (RP): eth2
>> Upstream MRIB next hop (RP): 10.1.3.2
>> Upstream RPF'(*,G): 10.1.3.2
>> Upstream state: Joined
>> Join timer: 52
>> Local receiver include WC: .O.
>> Joins RP: ...
>> Joins WC: ...
>> Join state: ...
>> Prune state: ...
>> Prune pending state: ...
>> I am assert winner state: ...
>> I am assert loser state: ...
>> Assert winner WC: ...
>> Assert lost WC: ...
>> Assert tracking WC: OO.
>> Could assert WC: .O.
>> I am DR: .OO
>> Immediate olist RP: ...
>> Immediate olist WC: .O.
>> Inherited olist SG: .O.
>> Inherited olist SG_RPT: .O.
>> PIM include WC: .O.
>>
>> root at xorp_router_1> show pim mfc
>> Group Source RP
>>
>> root at xorp_router_1> show mfea dataflow
>> Group Source
>>
>> root at xorp_router_1> show igmp group
>> Interface Group Source LastReported Timeout V State
>> eth2 224.0.0.2 0.0.0.0 10.1.3.2 250 2 E
>> eth2 224.0.0.13 0.0.0.0 10.1.3.2 251 2 E
>> eth2 224.0.0.22 0.0.0.0 10.1.3.2 254 2 E
>> eth3 224.0.0.2 0.0.0.0 10.1.2.1 255 2 E
>> eth3 224.0.0.13 0.0.0.0 10.1.2.1 254 2 E
>> eth3 224.0.0.22 0.0.0.0 10.1.2.1 251 2 E
>> eth3 230.230.230.1 0.0.0.0 10.1.2.2 255 2 E
>>
>> For XORP_ROUTER_2
>>
>> root at xorp_router_2> show pim join
>> Group Source RP Flags
>> 230.230.230.1 0.0.0.0 10.1.4.2 WC
>> Upstream interface (RP): eth9
>> Upstream MRIB next hop (RP): 10.1.4.2
>> Upstream RPF'(*,G): 10.1.4.2
>> Upstream state: Joined
>> Join timer: 46
>> Local receiver include WC: ...
>> Joins RP: ...
>> Joins WC: O..
>> Join state: O..
>> Prune state: ...
>> Prune pending state: ...
>> I am assert winner state: ...
>> I am assert loser state: ...
>> Assert winner WC: ...
>> Assert lost WC: ...
>> Assert tracking WC: OO.
>> Could assert WC: O..
>> I am DR: O.O
>> Immediate olist RP: ...
>> Immediate olist WC: O..
>> Inherited olist SG: O..
>> Inherited olist SG_RPT: O..
>> PIM include WC: ...
>>
>> root at xorp_router_2> show pim mfc
>> Group Source RP
>>
>> root at xorp_router_2> show mfea dataflow
>> Group Source
>>
>> root at xorp_router_2> show igmp group
>> Interface Group Source LastReported Timeout V State
>> eth8 224.0.0.2 0.0.0.0 10.1.3.2 242 2 E
>> eth8 224.0.0.13 0.0.0.0 10.1.3.2 246 2 E
>> eth8 224.0.0.22 0.0.0.0 10.1.3.2 248 2 E
>> eth9 224.0.0.2 0.0.0.0 10.1.4.1 257 2 E
>> eth9 224.0.0.13 0.0.0.0 10.1.4.2 259 2 E
>> eth9 224.0.0.22 0.0.0.0 10.1.4.1 256 2 E
>>
>> For XORP_ROUTER_3
>>
>> root at xorp_router_3> show pim join
>> Group Source RP Flags
>> --------- Some lines are skipped------------
>> 230.230.230.1 10.1.1.2 10.1.4.2 SG SPT DirectlyConnectedS
>> Upstream interface (S): eth11
>> Upstream interface (RP): register_vif
>> Upstream MRIB next hop (RP): UNKNOWN
>> Upstream MRIB next hop (S): UNKNOWN
>> Upstream RPF'(S,G): UNKNOWN
>> Upstream state: Joined
>> Register state: RegisterNoinfo RegisterNotCouldRegister
>> Join timer: 40
>> KAT(S,G) running: true
>> Local receiver include WC: ...
>> Local receiver include SG: ...
>> Local receiver exclude SG: ...
>> Joins RP: ...
>> Joins WC: O..
>> Joins SG: ...
>> Join state: ...
>> Prune state: ...
>> Prune pending state: ...
>> I am assert winner state: ...
>> I am assert loser state: ...
>> Assert winner WC: ...
>> Assert winner SG: ...
>> Assert lost WC: ...
>> Assert lost SG: ...
>> Assert lost SG_RPT: ...
>> Assert tracking SG: OO.
>> Could assert WC: O..
>> Could assert SG: O..
>> I am DR: OOO
>> Immediate olist RP: ...
>> Immediate olist WC: O..
>> Immediate olist SG: ...
>> Inherited olist SG: O..
>> Inherited olist SG_RPT: O..
>> PIM include WC: ...
>> PIM include SG: ...
>> PIM exclude SG: ...
>>
>> root at xorp_router_3> show pim mfc
>> Group Source RP
>> 230.230.230.1 10.1.1.2 10.1.4.2
>> Incoming interface : eth11
>> Outgoing interfaces: O..
>>
>> root at xorp_router_3> show mfea dataflow
>> Group Source
>> 230.230.230.1 10.1.1.2
>> Measured(Start|Packets|Bytes) Type Thresh(Interval|Packets|Bytes) Remain
>> 4448.914180|0|? <= 210.0|0|?
>> 159.890042
>>
>> root at xorp_router_3> show igmp group
>> Interface Group Source LastReported Timeout V State
>> eth10 224.0.0.2 0.0.0.0 10.1.4.1 248 2 E
>> eth10 224.0.0.13 0.0.0.0 10.1.4.2 250 2 E
>> eth10 224.0.0.22 0.0.0.0 10.1.4.1 248 2 E
>> eth11 224.0.0.2 0.0.0.0 10.1.1.1 255 2 E
>> eth11 224.0.0.13 0.0.0.0 10.1.1.1 138 2 E
>> eth11 224.0.0.22 0.0.0.0 10.1.1.1 259 2 E
>>
>> Moreover, on xorp_router_3 in logs I can see records about adding entry
>> to MFEA. But there are no such records in logs on xorp_router_1 and 2:
>> --------------Skipped lines--------------------
>> [ 2013/06/02 23:58:12.76422 TRACE xorp_pimsm4 PIM ] RX PIM_JOIN_PRUNE
>> from 10.1.4.1 to 224.0.0.13 on vif eth10
>> [ 2013/06/02 23:58:12.76729 TRACE xorp_pimsm4 PIM ] Add MFC entry:
>> (10.1.1.2, 230.230.230.1) iif = 1 olist = O.. olist_disable_wrongvif = ..O
>> [ 2013/06/02 23:58:12.76893 TRACE xorp_pimsm4 PIM ] Add MFC entry:
>> (10.1.1.2, 230.230.230.1) iif = 1 olist = O.. olist_disable_wrongvif = .OO
>> [ 2013/06/02 23:58:12.77098 TRACE xorp_fea:2032 MFEA
>> fea/mfea_mrouter.cc:1568 add_mfc ] Add MFC entry: (10.1.1.2, 230.230.230.1)
>> iif = 1 olist = O..
>> [ 2013/06/02 23:58:12.77362 TRACE xorp_fea:2032 MFEA
>> fea/mfea_mrouter.cc:1568 add_mfc ] Add MFC entry: (10.1.1.2, 230.230.230.1)
>> iif = 1 olist = O..
>> --------------Skipped lines--------------------
>>
>> What's wrong with this configuration? Why second and third routers don't
>> add entries to mfc?
>>
>
>
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