12-02-2002 04:20 AM - edited 03-02-2019 03:17 AM
Question is: how is rpf calculated?
Got 2 routers with 2 serials links with same bandwich
Routing is due to 2 static routers to the Loopback addresses and BGP is running between the loopback addresses.
Pim spare-mode is every ware enabled.
According to the book Developing IP Multicast Networks volume 1 page 134
The rpf should point to the highest next hop ip address.
But in real live my rpf is pointed to the lowers address, of miss I something?
Ip number 138.55.130.250 is loopback of router2
Router1>sh ip rou 138.55.130.250
Routing entry for 138.55.130.250/32
Known via "static", distance 1, metric 0 (connected)
Routing Descriptor Blocks:
directly connected, via Serial0/1.801
Route metric is 0, traffic share count is 1
* directly connected, via Serial0/0.701
Route metric is 0, traffic share count is 1
SGSGPUE2MP999>sh ip rpf 138.55.130.250
RPF information for router2 (138.55.130.250)
RPF interface: Serial0/1.801
RPF neighbor: router2 (138.55.132.13)
RPF route/mask: 138.55.130.250/32
RPF type: unicast (static)
RPF recursion count: 0
Doing distance-preferred lookups across tables
Router1>sh ip int brief
Serial0/0.701 138.55.132.66 --> highest ip address!
Serial0/1.801 138.55.132.14
Loopback0 161.126.91.62
12-09-2002 08:37 AM
The following link provides information on RPF troubleshooting
Multiple Equal Cost Paths Result in Unwanted Return Path Forwarding Behavior
http://www.cisco.com/warp/public/105/mcastguide4.html
IP Multicast Troubleshooting Guide
http://www.cisco.com/en/US/tech/tk648/tk363/technologies_tech_note09186a0080094b55.shtml
12-09-2002 08:49 AM
Both links explain that the RPF pointed to the highest next hop ip address.
in my example it's the Lowers IP address....
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