From: Venkatesh Palani (kvpalani@gmail.com)
Date: Sat Dec 17 2005 - 04:49:32 GMT-3
Hi Guys,
I was trying to play with PBR and BGP and found that there is a packet drop,
I mean alternate packet get dropped when using PBR, not sure why this
occurs. could any one help me. Below is the detail.
The lab toplogy is identical to the topology from the book CCIE practical
studies volume II Page 690 ( Lab14-BGP routing)
In the above toplogy the middle router Mocha does not aprticipate in BGP so
the author has used two static routes, When I tried replacing the static
route with PBR( I havent implemented completley I was tring only for two L0
addresses on the chocolate) on Mocha ( HUB in my toplogy) alternate packets
were dropped between Latte and Choclate loopback address. Please note this
works fine when static routes are used and also to add to this the packet
drop is two way meaning when I do an extended ping from chocolate I still
see the packet drop.
below is the names used in my lab.
Mocha - HUB
Latte - router 1
below are the details
Latte - router 1
-----------------------
router1#ping 108.201.17.1
Type escape sequence to abort.
Sending 5, 100-byte ICMP Echos to 108.201.17.1, timeout is 2 seconds:
!.!.!
Success rate is 60 percent (3/5), round-trip min/avg/max = 104/105/108 ms
router1#sh ip route 108.201.17.1
Routing entry for 108.201.17.0/24
Known via "bgp 409", distance 200, metric 0
Tag 507, type internal
Last update from 108.201.14.1 01:42:53 ago
Routing Descriptor Blocks:
* 108.201.14.1, from 10.1.1.3, 01:42:53 ago
Route metric is 0, traffic share count is 1
AS Hops 1
router1#ping 108.201.17.1
Type escape sequence to abort.
Sending 5, 100-byte ICMP Echos to 108.201.17.1, timeout is 2 seconds:
!
04:58:28: IP: s=192.168.1.2 (local), d=108.201.17.1 (Serial1), len 100,
sending
04:58:28: IP: s=108.201.17.1 (Serial1), d=192.168.1.2 (Serial1), len 100,
rcvd 3
04:58:28: IP: s=192.168.1.2 (local), d=108.201.17.1 (Serial1), len 100,
sending.
!
04:58:30: IP: s=192.168.1.2 (local), d=224.0.0.5 (Serial1), len 68, sending
broa
d/multicast
04:58:30: IP: s=192.168.1.2 (local), d=108.201.17.1 (Serial1), len 100,
sending
04:58:30: IP: s=108.201.17.1 (Serial1), d=192.168.1.2 (Serial1), len 100,
rcvd 3
04:58:30: IP: s=192.168.1.2 (local), d=108.201.17.1 (Serial1), len 100,
sending
04:58:31: IP: s=192.168.1.1 (Serial1), d=224.0.0.5, len 68, rcvd 0.!
Success rate is 60 percent (3/5), round-trip min/avg/max = 112/113/116 ms
Mocha - HUB
-----------------------
HUB#sh run int se 0/0.1
Building configuration...
Current configuration : 179 bytes
!
interface Serial0/0.1 point-to-point
ip address 192.168.1.1 255.255.255.252
ip ospf network point-to-point
ip policy route-map trial1
frame-relay interface-dlci 301
end
HUB#sh route-map trial1
route-map trial1, permit, sequence 10
Match clauses:
ip address (access-lists): 103
Set clauses:
ip next-hop 10.1.1.3
Policy routing matches: 61 packets, 5978 bytes
Extended IP access list 103
permit ip host 192.168.1.2 host 108.201.17.1 log-input (27 matches)
permit ip host 192.168.1.2 host 108.201.16.1 log-input
permit ip host 192.168.1.2 host 108.201.15.1 log-input (6 matches)
This archive was generated by hypermail 2.1.4 : Mon Jan 09 2006 - 07:07:51 GMT-3