Subject: RE: Multicast

From: [email-masked] (Jan Novak)
Date: Fri, 12 Dec 1997 09:08:34 +0100

Try the config without filters at first (and stay patient 4-5 minutes) - the upstream router is not aware
of them and will send the traffic until you prune it off, which is not possible due
to the filter 17 I would say (moreover this filters DVMRP updates only,
you can not filter out incoming traffic on the output of your line...).

-----Původní zpráva-----
Od:	Dimitris Zisiadis [SMTP:[email-masked]]
Odesláno:	11. prosince 1997 19:42
Komu:	[email-masked]
Kopie:	[email-masked]
Předmět:	Multicast

 Hello all,

we have a DVMRP tunnel to MCI in order for us to be able to 
emit multicast channels.

 The Cisco config follows:

interface Tunnel1
 description DVMRP tunnel to MCI
 ip unnumbered Loopback0
 ip accounting output-packets
 ip pim dense-mode
 ip dvmrp metric 1 list 16
 ip dvmrp accept-filter 17
 no ip mroute-cache
 ip sdr listen
 transmit-buffers backing-store
 tunnel source Loopback0
 tunnel destination 204.70.74.77
 tunnel mode dvmrp

 where 

access-list 16 permit 193.92.150.0 0.0.0.255
access-list 16 deny   any
 (we want to permit emissions only from this source)

access-list 17 deny   any

 (we don't want to accept any connection - i.e. accept
  the traffic in the incoming direction - so that we won't
  overload our link)

 We are facing two problems:
1- the tunnel to  mci is quite loaded (when it should have just
   a few Kbps..) and, even though MCI has put a traffic filter
   for 10 Kbps, we notice throuphput in the order of 200Kbps.
2- We are keep on getting some strange routes from another one 
   of our routers which does no have these routes !!
   The debugging though shows that the packets are coming from the tunnel !
   i.e.:

    sh int t1:
      5 minute input rate 214000 bits/sec, 114 packets/sec

    sh ip mroute:
     (130.240.64.62/32, 224.2.169.50), 00:00:40/00:02:19, flags: C
  Incoming interface: Serial0/1.1, RPF nbr 194.219.199.38
  Outgoing interface list:
    Tunnel0, Forward/Dvmrp, 00:00:40/00:00:00
    Serial0/0.1, Forward/Dense, 00:00:40/00:00:00
    Serial0/2.1, Forward/Dense, 00:00:40/00:00:00
    Serial0/3.1, Forward/Dense, 00:00:40/00:00:00
    Serial0/5, Forward/Dense, 00:00:40/00:00:00
    Ethernet1/2, Forward/Dense, 00:00:40/00:00:00
    Tunnel1, Forward/Dvmrp, 00:00:40/00:00:00
    
    where s0/1.1 is the interface to one of our other routers
    and NOT the tunnel 1 (s0/1.1 is the interafce from where the 
    source is reached).

   debug ip mpacket 224.2.169.50 :
     IP: s=130.240.64.62 (Tunnel1) d=224.2.169.50 len 212, not RPF interface
     IP: s=130.240.64.62 (Tunnel1) d=224.2.169.50 len 222, not RPF interface
     IP: s=130.240.64.62 (Tunnel1) d=224.2.169.50 len 222, not RPF interface
     IP: s=130.240.64.62 (Tunnel1) d=224.2.169.50 len 231, not RPF interface

 and 

 mtrace 130.240.64.62:

Type escape sequence to abort.
Mtrace from 130.240.64.62 to 194.219.199.37 via group 224.2.0.1
>From source (garlic.cdt.luth.se) to destination (titanS0/1.forthnet.gr)
Querying full reverse path... 
 0  titanS0/1.forthnet.gr (194.219.199.37)
-1  titanS0/1.forthnet.gr (194.219.199.37) PIM  thresh^ 0  67 ms  
-2  tromosS0.forthnet.gr (194.219.199.38) Proto 0  thresh^ 0  -260309 ms  No 
route

!!! Where tromosS0 is the other router connected to s0/1.1 interface !!

 Can you please advice on what is going wrong?

Thanks in advance

Dimitris Zisiadis
FORTHnet