Hi David,
Actually I do not want to track the interface status but ensure that a ping
is working.
This is because the router will not be directly connected to the router to
monitor.
Here's a quick overview of the lab setup:
Se0/1:0 Se0/1:0
\ |
\ |
R1 --1000--- R2
\ /
\ /
10 1000
\ /
\ /
R3
3 routers connected using OSPF with the specified costs and a full mesh BGP
network.
I want R1 to stop announcing route to se0/1:0 IP range when the IP address
of R2 (10.0.1.2) can't be pinged anymore.
At that time, the traffic destinated to that range should go to R2.
You can find the results of show track when the IP address is reachable or
not in attachment (R1_commands).
Also the config of each router is in attachment.
Thanks for your help,
-----Original Message-----
From: David Prall [mailto:[email protected]]
Sent: mardi 29 novembre 2011 15:02
To: 'Henry-Nicolas Tourneur'; [email protected]
Subject: RE: [c-nsp] Conditionnal routing based on OSPF / IP SLA
So why not just track the interface status? The static should go away if the
interface goes down? What does "sh track" show you? On your track object, I
always use state instead of reachability.
The following should accomplish what you are trying to do. If se0/1:0 is
down then it won't be advertised.
ip route 17.4.240.40 255.255.255.240 Se0/1:0 10.0.1.2 tag 1755
David
--
http://dcp.dcptech.com
-----Original Message-----
From: Henry-Nicolas Tourneur [mailto:[email protected]]
Sent: Tuesday, November 29, 2011 3:30 AM
To: 'David Prall'; [email protected]
Subject: RE: [c-nsp] Conditionnal routing based on OSPF / IP SLA
Hello David,
I tried the following, pretty straightforward setup.
I'v a full mesh iBGP running on 3 lab routers and OSPF between them (simple
triangle).
The IP to be checked is on a /30 in between R1 & R2, when this go down, I
want R1 to stop announcing the ip route (should disappear on R3).
The tag 1755 is to force the route to be advertised through iBGP and not
OSPF.
If the IP to be checked goes down, I can see that the SLA Monitor status
goes to down but yet, R1 keep advertising the route.
Any idea why?
ip sla monitor 1
type echo protocol ipIcmpEcho 10.0.1.2
timeout 800
frequency 2
!
ip sla monitor schedule 1 life forever start-time now
track 100 rtr 1 reachability
ip route 17.4.240.40 255.255.255.240 Se0/1:0 tag 1755 track 100
Thanks in advance :)
Henry-Nicolas Tourneur.
-----Original Message-----
From: David Prall [mailto:[email protected]]
Sent: jeudi 24 novembre 2011 19:20
To: 'Henry-Nicolas Tourneur'; [email protected]
Subject: RE: [c-nsp] Conditionnal routing based on OSPF / IP SLA
You can do this with track objects and static routing, then redistribute the
static into ospf. You could use a conditional route-map like they do in the
example for default as well. But I think putting a static in and
redistributing it will be much easier.
David
--
http://dcp.dcptech.com
-----Original Message-----
From: [email protected]
[mailto:[email protected]] On Behalf Of Henry-Nicolas
Tourneur
Sent: Thursday, November 24, 2011 10:28 AM
To: [email protected]
Subject: [c-nsp] Conditionnal routing based on OSPF / IP SLA
Hi all,
I'm currently trying to make a Cisco router to announce one network
statement based on the result of an IP Sla probe.
Currently, I found this tutorial:
http://hackingcisco.blogspot.com/2011/03/lab-33-ospf-conditional-default-rou
ting.html
But it's only for "default-information", I would need this for a particular
route.
Does anybody have an idea how to do this?
Thanks and regards,
Henry-Nicolas Tourneur.
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archive at http://puck.nether.net/pipermail/cisco-nsp/
version 12.4
service timestamps debug datetime msec localtime show-timezone
service timestamps log datetime msec localtime show-timezone
service password-encryption
!
hostname R2
!
boot-start-marker
boot-end-marker
!
logging buffered 65536 debugging
logging console informational
!
!
aaa session-id common
clock timezone CET 1
clock summer-time CET recurring last Sun Mar 2:00 last Sun Oct 3:00
no ip source-route
ip cef
!
!
!
controller E1 0/1
channel-group 0 timeslots 1-31
!
no ip domain lookup
!
!
interface Loopback0
ip address 172.16.10.2 255.255.255.255
!
interface FastEthernet0/0
no shut
cdp enable
description #backbone: R1
duplex auto
speed auto
ip address 10.0.1.2 255.255.255.252
no ip redirects
no ip proxy-arp
ip ospf cost 1000
ip ospf hello-interval 1
!
interface FastEthernet0/1
no shut
cdp enable
description #backbone: R3
duplex auto
speed auto
ip address 10.0.3.1 255.255.255.252
no ip redirects
no ip proxy-arp
ip ospf cost 1000
ip ospf hello-interval 1
!
interface Serial0/1:0
no shut
cdp enable
description CLIENT
ip address 17.4.240.241 255.255.255.240
no ip redirects
no ip proxy-arp
!
router ospf 1755
router-id 172.16.10.2
log-adjacency-changes
auto-cost reference-bandwidth 1000
redistribute static metric 1 metric-type 1 subnets route-map redist_ospf_static
passive-interface default
network 172.16.10.2 0.0.0.0 area 0
network 10.0.1.0 0.0.0.3 area 0
network 10.0.3.0 0.0.0.3 area 0
no passive-interface FastEthernet0/0
no passive-interface FastEthernet0/1
!
router bgp 65535
no synchronization
bgp router-id 172.16.10.2
bgp log-neighbor-changes
network 17.4.240.240 mask 255.255.255.240
neighbor iBGP peer-group
neighbor iBGP remote-as 65535
neighbor iBGP update-source Loopback0
neighbor 172.16.10.1 peer-group iBGP
neighbor 172.16.10.1 description R1
neighbor 172.16.10.3 peer-group iBGP
neighbor 172.16.10.3 description R3
no auto-summary
!
ip forward-protocol nd
route-map redist_ospf_static deny 10
match tag 1755
!
route-map redist_ospf_static permit 20
!
!
access-list 10 permit 17.4.240.240 0.0.0.15
access-list 10 permit 17.4.240.0 0.0.0.127
access-list 10 deny any
access-list 20 permit 17.4.240.0 0.0.0.31
access-list 20 permit 17.4.240.240 0.0.0.15
access-list 20 deny any
!
control-plane
!
!
alias exec sif sh int | i Descr|protocol|CRC
alias exec sib sh ip int brief
alias exec sir sh ip route
alias exec sid sh int desc
alias exec tm term mon
alias exec tnm term no mon
alias exec ua undebug all
alias exec sion show ip ospf ne
alias exec sal sh ip access-list
alias exec sc sh diag | i Slot|port|FRU|Serial
alias exec srro sh run | begin ^router ospf
alias exec srrb sh run | begin ^router bgp
alias exec sri sh run int
alias exec svb sh vlan brief
alias exec smv sh mac-address vlan
alias exec smi sh mac-address interface
!
line con 0
exec-timeout 30 0
logging synchronous
line aux 0
transport input all
transport output none
stopbits 1
line vty 0 4
exec-timeout 30 0
logging synchronous
!
end
version 12.4
service timestamps debug datetime msec localtime show-timezone
service timestamps log datetime msec localtime show-timezone
service password-encryption
!
hostname R3
!
boot-start-marker
boot-end-marker
!
logging buffered 65536 debugging
logging console informational
!
!
aaa session-id common
clock timezone CET 1
clock summer-time CET recurring last Sun Mar 2:00 last Sun Oct 3:00
no ip source-route
ip cef
!
!
!
!
no ip domain lookup
!
!
interface Loopback0
ip address 172.16.10.3 255.255.255.255
!
interface FastEthernet0/0
no shut
cdp enable
description #backbone: R2
duplex auto
speed auto
ip address 10.0.3.2 255.255.255.252
no ip redirects
no ip proxy-arp
ip ospf cost 1000
ip ospf hello-interval 1
!
interface FastEthernet0/1
no shut
cdp enable
description #backbone: R1
duplex auto
speed auto
ip address 10.0.2.2 255.255.255.252
no ip redirects
no ip proxy-arp
ip ospf cost 10
ip ospf hello-interval 1
!
router ospf 1755
router-id 172.16.10.3
log-adjacency-changes
auto-cost reference-bandwidth 1000
redistribute static metric 1 metric-type 1 subnets route-map redist_ospf_static
passive-interface default
network 172.16.10.3 0.0.0.0 area 0
network 10.0.2.0 0.0.0.3 area 0
network 10.0.3.0 0.0.0.3 area 0
no passive-interface FastEthernet0/0
no passive-interface FastEthernet0/1
!
router bgp 65535
no synchronization
bgp router-id 172.16.10.3
bgp log-neighbor-changes
neighbor iBGP peer-group
neighbor iBGP remote-as 65535
neighbor iBGP update-source Loopback0
neighbor 172.16.10.1 peer-group iBGP
neighbor 172.16.10.1 description R1
neighbor 172.16.10.2 peer-group iBGP
neighbor 172.16.10.2 description R2
no auto-summary
!
ip forward-protocol nd
route-map redist_ospf_static deny 10
match tag 1755
!
route-map redist_ospf_static permit 20
!
!
access-list 10 permit 17.4.240.240 0.0.0.15
access-list 10 permit 17.4.240.0 0.0.0.127
access-list 10 deny any
access-list 20 permit 17.4.240.0 0.0.0.31
access-list 20 permit 17.4.240.240 0.0.0.15
access-list 20 deny any
!
control-plane
!
!
alias exec sif sh int | i Descr|protocol|CRC
alias exec sib sh ip int brief
alias exec sir sh ip route
alias exec sid sh int desc
alias exec tm term mon
alias exec tnm term no mon
alias exec ua undebug all
alias exec sion show ip ospf ne
alias exec sal sh ip access-list
alias exec sc sh diag | i Slot|port|FRU|Serial
alias exec srro sh run | begin ^router ospf
alias exec srrb sh run | begin ^router bgp
alias exec sri sh run int
alias exec svb sh vlan brief
alias exec smv sh mac-address vlan
alias exec smi sh mac-address interface
!
line con 0
exec-timeout 30 0
logging synchronous
line aux 0
transport input all
transport output none
stopbits 1
line vty 0 4
exec-timeout 30 0
logging synchronous
!
end
version 12.4
service timestamps debug datetime msec localtime show-timezone
service timestamps log datetime msec localtime show-timezone
service password-encryption
!
hostname R1
!
boot-start-marker
boot-end-marker
!
logging buffered 65536 debugging
logging console informational
!
!
aaa session-id common
clock timezone CET 1
clock summer-time CET recurring last Sun Mar 2:00 last Sun Oct 3:00
no ip source-route
ip cef
!
!
controller E1 0/1
channel-group 0 timeslots 1-31
!
!
!
no ip domain lookup
!
!
interface Loopback0
ip address 172.16.10.1 255.255.255.255
!
interface FastEthernet0/0
no shut
cdp enable
description #backbone: R2
duplex auto
speed auto
ip address 10.0.1.1 255.255.255.252
no ip redirects
no ip proxy-arp
ip ospf cost 1000
ip ospf hello-interval 1
!
interface FastEthernet0/1
no shut
cdp enable
description #backbone: R3
duplex auto
speed auto
ip address 10.0.2.1 255.255.255.252
no ip redirects
no ip proxy-arp
ip ospf cost 10
ip ospf hello-interval 1
!
interface Serial0/1:0
no shut
cdp enable
description CLIENT
ip address 17.4.240.241 255.255.255.240
no ip redirects
no ip proxy-arp
!
router ospf 1755
router-id 172.16.10.1
log-adjacency-changes
auto-cost reference-bandwidth 1000
redistribute static metric 1 metric-type 1 subnets route-map redist_ospf_static
passive-interface default
network 172.16.10.1 0.0.0.0 area 0
network 10.0.1.0 0.0.0.3 area 0
network 10.0.2.0 0.0.0.3 area 0
no passive-interface FastEthernet0/0
no passive-interface FastEthernet0/1
!
router bgp 65535
no synchronization
bgp router-id 172.16.10.1
bgp log-neighbor-changes
neighbor iBGP peer-group
neighbor iBGP remote-as 65535
neighbor iBGP update-source Loopback0
neighbor 172.16.10.2 peer-group iBGP
neighbor 172.16.10.2 description R2
neighbor 172.16.10.3 peer-group iBGP
neighbor 172.16.10.3 description R3
no auto-summary
!
ip forward-protocol nd
ip sla monitor 1
type echo protocol ipIcmpEcho 10.0.1.2
timeout 800
frequency 2
!
ip sla monitor schedule 1 life forever start-time now
track 100 rtr 1 state
ip route 17.4.240.240 255.255.255.240 Se0/1:0 tag 1755 track 100
route-map redist_ospf_static deny 10
match tag 1755
!
route-map redist_ospf_static permit 20
!
!
access-list 10 permit 17.4.240.240 0.0.0.15
access-list 10 permit 17.4.240.0 0.0.0.127
access-list 10 deny any
access-list 20 permit 17.4.240.0 0.0.0.31
access-list 20 permit 17.4.240.240 0.0.0.15
access-list 20 deny any
!
control-plane
!
!
alias exec sif sh int | i Descr|protocol|CRC
alias exec sib sh ip int brief
alias exec sir sh ip route
alias exec sid sh int desc
alias exec tm term mon
alias exec tnm term no mon
alias exec ua undebug all
alias exec sion show ip ospf ne
alias exec sal sh ip access-list
alias exec sc sh diag | i Slot|port|FRU|Serial
alias exec srro sh run | begin ^router ospf
alias exec srrb sh run | begin ^router bgp
alias exec sri sh run int
alias exec svb sh vlan brief
alias exec smv sh mac-address vlan
alias exec smi sh mac-address interface
!
line con 0
exec-timeout 30 0
logging synchronous
line aux 0
transport input all
transport output none
stopbits 1
line vty 0 4
exec-timeout 30 0
logging synchronous
!
end
R1#sh track
Track 100
Response Time Reporter 1 state
State is Up
1 change, last change 00:02:39
Latest operation return code: OK
Latest RTT (millisecs) 1
Tracked by:
STATIC-IP-ROUTING 0
R1#
R1#
R1#
R1#
*Mar 2 05:57:05.049 CET: %OSPF-5-ADJCHG: Process 1755, Nbr 172.16.10.2 on
FastEthernet0/0 from FULL to DOWN, Neighbor Down: Dead timer expired
*Mar 2 05:57:05.409 CET: %TRACKING-5-STATE: 100 rtr 1 state Up->Down
*Mar 2 05:57:05.885 CET: %LINEPROTO-5-UPDOWN: Line protocol on Interface
FastEthernet0/0, changed state to down
R1#
R1#
R1#sh track
Track 100
Response Time Reporter 1 state
State is Down
2 changes, last change 00:00:03
Latest operation return code: Timeout
Tracked by:
STATIC-IP-ROUTING 0
R1#
R1#
R1#sh ip bgp nei 172.16.10.3 advertised-routes
BGP table version is 4, local router ID is 172.16.10.1
Status codes: s suppressed, d damped, h history, * valid, > best, i - internal,
r RIB-failure, S Stale
Origin codes: i - IGP, e - EGP, ? - incomplete
Network Next Hop Metric LocPrf Weight Path
*> 17.4.240.240/28
0.0.0.0 0 32768 i
Total number of prefixes 1
R1#
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