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BGP + Route map + Next Hop
- 01-17-2007
- David Sudjiman
January 17, 2007, 8:03 am
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Hi,
I created these routers with below configuration
R1===================R2
R1 connected to R2 with DTE-DCE serial.
hostname R1
!
interface Loopback0
ip address 131.108.1.1 255.255.255.0
ip policy route-map FROM-131.108.1.1-TO-131.108.3.1
!
interface Loopback1
ip address 131.108.4.1 255.255.255.0
ip policy route-map FROM-131.108.4.1-TO-131.108.6.1
!
interface Serial0
ip address 131.108.2.1 255.255.255.252
no fair-queue
!
interface Serial1
ip address 131.108.5.1 255.255.255.252
clockrate 56000
!
router bgp 1
bgp log-neighbor-changes
network 131.108.1.0 mask 255.255.255.0
network 131.108.4.0 mask 255.255.255.0
neighbor 131.108.2.2 remote-as 2
neighbor 131.108.5.2 remote-as 2
!
access-list 100 permit icmp host 131.108.1.1 host 131.108.3.1
access-list 101 permit icmp host 131.108.4.1 host 131.108.6.1
route-map FROM-131.108.1.1-TO-131.108.3.1 permit 10
match ip address 100
set ip next-hop 131.108.2.2
!
route-map FROM-131.108.4.1-TO-131.108.6.1 permit 10
match ip address 101
set ip next-hop 131.108.5.2
=========================
hostname R2
!
interface Loopback0
ip address 131.108.3.1 255.255.255.0
!
interface Loopback1
ip address 131.108.6.1 255.255.255.0
!
interface Serial0
ip address 131.108.2.2 255.255.255.252
no fair-queue
clockrate 56000
!
interface Serial1
ip address 131.108.5.2 255.255.255.252
!
router bgp 2
bgp log-neighbor-changes
network 131.108.3.0 mask 255.255.255.0
network 131.108.6.0 mask 255.255.255.0
neighbor 131.108.2.1 remote-as 1
neighbor 131.108.5.1 remote-as 1
=============================
R1#sh ip route
Codes: C - connected, S - static, I - IGRP, R - RIP, M - mobile, B - BGP
D - EIGRP, EX - EIGRP external, O - OSPF, IA - OSPF inter area
N1 - OSPF NSSA external type 1, N2 - OSPF NSSA external type 2
E1 - OSPF external type 1, E2 - OSPF external type 2, E - EGP
i - IS-IS, su - IS-IS summary, L1 - IS-IS level-1, L2 - IS-IS
level-2
ia - IS-IS inter area, * - candidate default, U - per-user
static route
o - ODR, P - periodic downloaded static route
Gateway of last resort is not set
131.108.0.0/16 is variably subnetted, 6 subnets, 2 masks
B 131.108.6.0/24 [20/0] via 131.108.2.2, 00:28:55
C 131.108.5.0/30 is directly connected, Serial1
C 131.108.4.0/24 is directly connected, Loopback1
B 131.108.3.0/24 [20/0] via 131.108.2.2, 00:28:55
C 131.108.2.0/30 is directly connected, Serial0
C 131.108.1.0/24 is directly connected, Loopback0
R1#sh ip bgp
BGP table version is 5, local router ID is 131.108.4.1
Status codes: s suppressed, d damped, h history, * valid, > best, i -
internal
Origin codes: i - IGP, e - EGP, ? - incomplete
Network Next Hop Metric LocPrf Weight Path
*> 131.108.1.0/24 0.0.0.0 0 32768 i
* 131.108.3.0/24 131.108.5.2 0 0 2 i
*> 131.108.2.2 0 0 2 i
*> 131.108.4.0/24 0.0.0.0 0 32768 i
* 131.108.6.0/24 131.108.5.2 0 0 2 i
*> 131.108.2.2 0 0 2 i
========================================================
When I tried to ping from 131.108.4.1 to 131.108.6.1, the route-map
didn't pickup anything.
R1#debug ip policy
Policy routing debugging is on
R1#ping
Protocol [ip]:
Target IP address: 131.108.6.1
Repeat count [5]:
Datagram size [100]:
Timeout in seconds [2]:
Extended commands [n]: y
Source address or interface: 131.108.4.1
Type of service [0]:
Set DF bit in IP header? [no]:
Validate reply data? [no]:
Data pattern [0xABCD]:
Loose, Strict, Record, Timestamp, Verbose[none]:
Sweep range of sizes [n]:
Type escape sequence to abort.
Sending 5, 100-byte ICMP Echos to 131.108.6.1, timeout is 2 seconds:
Packet sent with a source address of 131.108.4.1
!!!!!
Success rate is 100 percent (5/5), round-trip min/avg/max = 36/36/40 ms
R1#u all
R1#debug ip packet
IP packet debugging is on
R1#ping
Protocol [ip]:
Target IP address: 131.108.6.1
Repeat count [5]:
Datagram size [100]:
Timeout in seconds [2]:
Extended commands [n]: y
Source address or interface: 131.108.4.1
Type of service [0]:
Set DF bit in IP header? [no]:
Validate reply data? [no]:
Data pattern [0xABCD]:
Loose, Strict, Record, Timestamp, Verbose[none]:
Sweep range of sizes [n]:
Type escape sequence to abort.
Sending 5, 100-byte ICMP Echos to 131.108.6.1, timeout is 2 seconds:
Packet sent with a source address of 131.108.4.1
!!!!!
Success rate is 100 percent (5/5), round-trip min/avg/max = 52/73/124 ms
R1#
00:40:46: IP: tableid=0, s=131.108.4.1 (local), d=131.108.6.1 (Serial0),
routed via RIB
00:40:46: IP: s=131.108.4.1 (local), d=131.108.6.1 (Serial0), len 100,
sending
00:40:46: IP: tableid=0, s=131.108.6.1 (Serial0), d=131.108.4.1
(Loopback1), routed via RIB
00:40:46: IP: s=131.108.6.1 (Serial0), d=131.108.4.1, len 100, rcvd 4
00:40:46: IP: tableid=0, s=131.108.4.1 (local), d=131.108.6.1 (Serial0),
routed via RIB
00:40:46: IP: s=131.108.4.1 (local), d=131.108.6.1 (Serial0), len 100,
sending
00:40:46: IP: tableid=0, s=131.108.6.1 (Serial0), d=131.108.4.1
(Loopback1), routed via RIB
00:40:46: IP: s=131.108.6.1 (Serial0), d=131.108.4.1, len 100, rcvd 4
00:40:46: IP: tableid=0, s=131.108.4.1 (local), d=131.108.6.1 (Serial0),
routed via RIB
00:40:46: IP: s=131.108.4.1 (local), d=131.108.6.1 (Serial0), len 100,
sending
00:40:46: IP: tableid=0, s=131.108.6.1 (Serial0), d=131.108.4.1
(Loopback1), routed via RIB
00:40:46: IP: s=131.108.6.1 (Serial0), d=131.108.4.1, len 100, rcvd 4
00:40:46: IP: tableid=0, s=131.108.4.1 (local), d=131.108.6.1 (Serial0),
routed via RIB
00:40:46: IP: s=131.108.4.1 (local), d=131.108.6.1 (Serial0), len 100,
sending
00:40:46: IP: tableid=0, s=131.108.6.1 (Serial0), d=131.108.4.1
(Loopback1), routed via RIB
00:40:46: IP: s=131.108.6.1 (Serial0), d=131.108.4.1, len 100, rcvd 4
00:40:46: IP: tableid=0, s=131.108.4.1 (local), d=131.108.6.1 (Serial0),
routed via RIB
00:40:46: IP: s=131.108.4.1 (local), d=131.108.6.1 (Serial0), len 100,
sending
00:40:46: IP: tableid=0, s=131.108.6.1 (Serial0), d=131.108.4.1
(Loopback1), routed via RIB
00:40:46: IP: s=131.108.6.1 (Serial0), d=131.108.4.1, len 100, rcvd 4
==================================
What I want were:
any ICMP from 131.108.1.1 to 131.108.3.1 will be delivered using route
131.108.1.1-131.108.2.1-131.108.2.2-131.108.3.1
any ICMP from 131.108.4.1 to 131.108.6.1 will be delivered using route
131.108.4.1-131.108.5.1-131.108.5.2-131.108.6.1
1. Where was the wrong part of configuration?
2. Why?
3. How can I fix it?
--
thx
David Sudjiman
http://www.davidsudjiman.info
I created these routers with below configuration
R1===================R2
R1 connected to R2 with DTE-DCE serial.
hostname R1
!
interface Loopback0
ip address 131.108.1.1 255.255.255.0
ip policy route-map FROM-131.108.1.1-TO-131.108.3.1
!
interface Loopback1
ip address 131.108.4.1 255.255.255.0
ip policy route-map FROM-131.108.4.1-TO-131.108.6.1
!
interface Serial0
ip address 131.108.2.1 255.255.255.252
no fair-queue
!
interface Serial1
ip address 131.108.5.1 255.255.255.252
clockrate 56000
!
router bgp 1
bgp log-neighbor-changes
network 131.108.1.0 mask 255.255.255.0
network 131.108.4.0 mask 255.255.255.0
neighbor 131.108.2.2 remote-as 2
neighbor 131.108.5.2 remote-as 2
!
access-list 100 permit icmp host 131.108.1.1 host 131.108.3.1
access-list 101 permit icmp host 131.108.4.1 host 131.108.6.1
route-map FROM-131.108.1.1-TO-131.108.3.1 permit 10
match ip address 100
set ip next-hop 131.108.2.2
!
route-map FROM-131.108.4.1-TO-131.108.6.1 permit 10
match ip address 101
set ip next-hop 131.108.5.2
=========================
hostname R2
!
interface Loopback0
ip address 131.108.3.1 255.255.255.0
!
interface Loopback1
ip address 131.108.6.1 255.255.255.0
!
interface Serial0
ip address 131.108.2.2 255.255.255.252
no fair-queue
clockrate 56000
!
interface Serial1
ip address 131.108.5.2 255.255.255.252
!
router bgp 2
bgp log-neighbor-changes
network 131.108.3.0 mask 255.255.255.0
network 131.108.6.0 mask 255.255.255.0
neighbor 131.108.2.1 remote-as 1
neighbor 131.108.5.1 remote-as 1
=============================
R1#sh ip route
Codes: C - connected, S - static, I - IGRP, R - RIP, M - mobile, B - BGP
D - EIGRP, EX - EIGRP external, O - OSPF, IA - OSPF inter area
N1 - OSPF NSSA external type 1, N2 - OSPF NSSA external type 2
E1 - OSPF external type 1, E2 - OSPF external type 2, E - EGP
i - IS-IS, su - IS-IS summary, L1 - IS-IS level-1, L2 - IS-IS
level-2
ia - IS-IS inter area, * - candidate default, U - per-user
static route
o - ODR, P - periodic downloaded static route
Gateway of last resort is not set
131.108.0.0/16 is variably subnetted, 6 subnets, 2 masks
B 131.108.6.0/24 [20/0] via 131.108.2.2, 00:28:55
C 131.108.5.0/30 is directly connected, Serial1
C 131.108.4.0/24 is directly connected, Loopback1
B 131.108.3.0/24 [20/0] via 131.108.2.2, 00:28:55
C 131.108.2.0/30 is directly connected, Serial0
C 131.108.1.0/24 is directly connected, Loopback0
R1#sh ip bgp
BGP table version is 5, local router ID is 131.108.4.1
Status codes: s suppressed, d damped, h history, * valid, > best, i -
internal
Origin codes: i - IGP, e - EGP, ? - incomplete
Network Next Hop Metric LocPrf Weight Path
*> 131.108.1.0/24 0.0.0.0 0 32768 i
* 131.108.3.0/24 131.108.5.2 0 0 2 i
*> 131.108.2.2 0 0 2 i
*> 131.108.4.0/24 0.0.0.0 0 32768 i
* 131.108.6.0/24 131.108.5.2 0 0 2 i
*> 131.108.2.2 0 0 2 i
========================================================
When I tried to ping from 131.108.4.1 to 131.108.6.1, the route-map
didn't pickup anything.
R1#debug ip policy
Policy routing debugging is on
R1#ping
Protocol [ip]:
Target IP address: 131.108.6.1
Repeat count [5]:
Datagram size [100]:
Timeout in seconds [2]:
Extended commands [n]: y
Source address or interface: 131.108.4.1
Type of service [0]:
Set DF bit in IP header? [no]:
Validate reply data? [no]:
Data pattern [0xABCD]:
Loose, Strict, Record, Timestamp, Verbose[none]:
Sweep range of sizes [n]:
Type escape sequence to abort.
Sending 5, 100-byte ICMP Echos to 131.108.6.1, timeout is 2 seconds:
Packet sent with a source address of 131.108.4.1
!!!!!
Success rate is 100 percent (5/5), round-trip min/avg/max = 36/36/40 ms
R1#u all
R1#debug ip packet
IP packet debugging is on
R1#ping
Protocol [ip]:
Target IP address: 131.108.6.1
Repeat count [5]:
Datagram size [100]:
Timeout in seconds [2]:
Extended commands [n]: y
Source address or interface: 131.108.4.1
Type of service [0]:
Set DF bit in IP header? [no]:
Validate reply data? [no]:
Data pattern [0xABCD]:
Loose, Strict, Record, Timestamp, Verbose[none]:
Sweep range of sizes [n]:
Type escape sequence to abort.
Sending 5, 100-byte ICMP Echos to 131.108.6.1, timeout is 2 seconds:
Packet sent with a source address of 131.108.4.1
!!!!!
Success rate is 100 percent (5/5), round-trip min/avg/max = 52/73/124 ms
R1#
00:40:46: IP: tableid=0, s=131.108.4.1 (local), d=131.108.6.1 (Serial0),
routed via RIB
00:40:46: IP: s=131.108.4.1 (local), d=131.108.6.1 (Serial0), len 100,
sending
00:40:46: IP: tableid=0, s=131.108.6.1 (Serial0), d=131.108.4.1
(Loopback1), routed via RIB
00:40:46: IP: s=131.108.6.1 (Serial0), d=131.108.4.1, len 100, rcvd 4
00:40:46: IP: tableid=0, s=131.108.4.1 (local), d=131.108.6.1 (Serial0),
routed via RIB
00:40:46: IP: s=131.108.4.1 (local), d=131.108.6.1 (Serial0), len 100,
sending
00:40:46: IP: tableid=0, s=131.108.6.1 (Serial0), d=131.108.4.1
(Loopback1), routed via RIB
00:40:46: IP: s=131.108.6.1 (Serial0), d=131.108.4.1, len 100, rcvd 4
00:40:46: IP: tableid=0, s=131.108.4.1 (local), d=131.108.6.1 (Serial0),
routed via RIB
00:40:46: IP: s=131.108.4.1 (local), d=131.108.6.1 (Serial0), len 100,
sending
00:40:46: IP: tableid=0, s=131.108.6.1 (Serial0), d=131.108.4.1
(Loopback1), routed via RIB
00:40:46: IP: s=131.108.6.1 (Serial0), d=131.108.4.1, len 100, rcvd 4
00:40:46: IP: tableid=0, s=131.108.4.1 (local), d=131.108.6.1 (Serial0),
routed via RIB
00:40:46: IP: s=131.108.4.1 (local), d=131.108.6.1 (Serial0), len 100,
sending
00:40:46: IP: tableid=0, s=131.108.6.1 (Serial0), d=131.108.4.1
(Loopback1), routed via RIB
00:40:46: IP: s=131.108.6.1 (Serial0), d=131.108.4.1, len 100, rcvd 4
00:40:46: IP: tableid=0, s=131.108.4.1 (local), d=131.108.6.1 (Serial0),
routed via RIB
00:40:46: IP: s=131.108.4.1 (local), d=131.108.6.1 (Serial0), len 100,
sending
00:40:46: IP: tableid=0, s=131.108.6.1 (Serial0), d=131.108.4.1
(Loopback1), routed via RIB
00:40:46: IP: s=131.108.6.1 (Serial0), d=131.108.4.1, len 100, rcvd 4
==================================
What I want were:
any ICMP from 131.108.1.1 to 131.108.3.1 will be delivered using route
131.108.1.1-131.108.2.1-131.108.2.2-131.108.3.1
any ICMP from 131.108.4.1 to 131.108.6.1 will be delivered using route
131.108.4.1-131.108.5.1-131.108.5.2-131.108.6.1
1. Where was the wrong part of configuration?
2. Why?
3. How can I fix it?
--
thx
David Sudjiman
http://www.davidsudjiman.info
Re: BGP + Route map + Next Hop
David Sudjiman wrote:
Well, I tried by using e0 and put my laptop. The icmp packet goes to the
destined network but not going through the path I want.
However, one thing that confuse me. It worked using "ip local policy".
Can somebody explain to me why I can't using per interface ip policy?
--
thx
David Sudjiman
http://www.davidsudjiman.info
Well, I tried by using e0 and put my laptop. The icmp packet goes to the
destined network but not going through the path I want.
However, one thing that confuse me. It worked using "ip local policy".
Can somebody explain to me why I can't using per interface ip policy?
--
thx
David Sudjiman
http://www.davidsudjiman.info
Re: BGP + Route map + Next Hop
I've created a diagram and several info if you keen to help
I have two routers that connected back-to-back using two serials. I also
have each e0 on each router (R1 and R2) configured. both routers are
using BGP AS 1 and BGP as 2, respectively. What I’m trying to do next is
to make any ICMP packets from R1’s e0 going to path R1E0-R1S1-R2S1-R2E0.
I’m using route-map and next hop to achieve this.
The problem is why can’t I use ip policy route-map on the interface yet
I have to use ip LOCAL policy route-map to do this?
http://www.davidsudjiman.info/?p=149
--
thx
David Sudjiman
http://www.davidsudjiman.info
I have two routers that connected back-to-back using two serials. I also
have each e0 on each router (R1 and R2) configured. both routers are
using BGP AS 1 and BGP as 2, respectively. What I’m trying to do next is
to make any ICMP packets from R1’s e0 going to path R1E0-R1S1-R2S1-R2E0.
I’m using route-map and next hop to achieve this.
The problem is why can’t I use ip policy route-map on the interface yet
I have to use ip LOCAL policy route-map to do this?
http://www.davidsudjiman.info/?p=149
--
thx
David Sudjiman
http://www.davidsudjiman.info
Re: BGP + Route map + Next Hop
Hi,
Policy routing applied to an interface is only taken in consideration =
for traffic entering that interface and not for locally generated =
traffic ( for locally generated traffic you use ip local policy )
Your ping trest from the Windows box connected to e0/0 probably failed =
due to an error in route-map ( e.g access-list 100 permit icmp host =
20.20.20.1 host 10.10.10.1 )
Try something like this:
Applying that route map to either e0/0 and as "local policy" should give =
you a consistent result
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