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Chiverel
newbie
Topic Author
Posts: 46
Joined: Fri Jan 12, 2018 7:28 pm

PIM warnings, but setup is working

Fri Jun 22, 2018 4:49 pm

Hi, next test scenario from me (image is clickable).
ImageImage

Router A is a wireless bridge. All ports and wireless adapter are bridged. Bridge has DHCP-client configured.
Router B is the edge router. It has following bridges:
  • Wireless. DHCP server, gw 192.168.100.60 / 27
  • Wired. DHCP server, gw 192.168.100.1 / 27
  • OpenVPN in TAP-mode. 192.168.110.1 / 28
  • Guest. It is isolated from the networks above and doesn’t participate in PIM setup
Let’s say I have a media server connected to router A on eth1 and it has IP 192.168.100.58.
Local receivers are connected to a random port and network segment (wired or wireless).
Remote receiver is connected to router B over Open-Vpn and has IP 192.168.110.12.

Router A PIM config
  
/routing pim interface
add alternative-subnets=192.168.110.0/28,192.168.100.0/27 interface=Br
/routing pim rp
add address=192.168.100.1

Router B PIM config
  
/routing pim bsr-candidates
add interface=vid10-home-1G priority=5
/routing pim interface
add dr-priority=5 interface=vid10-home-1G
add dr-priority=10 interface=vid10-home-wireless
add alternative-subnets=192.168.110.0/28 dr-priority=14 interface=OpenVpn-Br
/routing pim rp
add address=192.168.100.1 priority=3


The setup works fine in most cases. However, I have 2 questions:
  1. When I’m connected via VPN, OpenVpn-Br doesn’t always appear in the MFC list. I need to reconnect client sometimes to see it in MFC. Why this PIM interface is flapping?
  2. I can see multiple repeating entries in the log saying that routing is not complete. Something like this:
    RX IGMP_V2_MEMBERSHIP_REPORT from 192.168.100.60 to 239.255.255.250 on vif vid10-home-1G: source must be directly connected
    ---//---- 192.168.100.58 to 239.255.255.250 on vif vid10-home-1G -----//-------
    ---//---- 192.168.100.58 to 239.255.255.250 on vif vid10-home-1G -----//-------
    ---//---- 192.168.100.1 to 239.255.255.250 on vif OpenVpn-Br -----//-------
    ---//---- 192.168.100.58 to 239.255.255.250 on vif OpenVpn-Br -----//-------
    ---//---- 192.168.10.58 to 239.255.255.250 on vif OpenVpn-Br -----//-------

    According to Cisco Mcast troubleshooting guide, mcast routes are obtained from:
    • Static mroutes
    • DVMRP routes
    • MBGP routes
    • Unicast routes
    Since the setup works fine, both unicast and mcast scenarios (testing using DLNA, FTP, web-services, ping etc.). What routing entries are missing?
 
Chiverel
newbie
Topic Author
Posts: 46
Joined: Fri Jan 12, 2018 7:28 pm

Re: PIM warnings, but setup is working

Sat Jun 30, 2018 10:06 pm

The answer for the 1st question was my stupid mistake. OpenVPN interface had the same local address as the Bridge, to what it is connected. It seems like that IP is removed from PIM upon tunnel disconnect, this is why route to Bridge was removed and did not appear in MFC. I've changed local address of OpenVpn to another IP and problem was gone.

But the 2nd question is still a mystery for me.

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