03-17-2008 02:58 AM - edited 03-05-2019 09:47 PM
Hi,
I have two sites with 2 routers each as follows:
site1 - router1 - primary link - router1 - site2
site1 - router2 - secondary link - router 2 - site2
The ethernet interface for router1 & router 2 are different (different subnet)..
I want to implement the HSRP..Can you please help me..
Thanks in advance
Mohamed
03-17-2008 04:07 AM
Hi,
HSRP requires the two routers to have a common LAN and to be on the same subnet.
In your case make sure the two routers are in the same LAN. You might use secondary IP addresses on the LAN interfaces of both routers to support two subnets and deliver redundancy and two HSRP groups, one for each subnet.
For a detailed description of the Operation of HSRP please have a look at
http://www.cisco.com/en/US/docs/ios/12_4t/ip_appl/configuration/guide/htaiphsr.html#wp1053967
Hope this helps!
Regards, Martin
03-17-2008 06:10 AM
Hi,
Could you please advise if the below configuration is correct; according to your recommendation?
This is an example configuration for site1:
Router1 (primary)
interface Ethernet0
ip address 192.168.10.3 255.255.255.0
ip address 10.10.0.1 255.255.255.0 secondary
standby 1 ip 10.10.0.3
standby 1 preempt
standby 1 priority 100
standby 1 authentication denmark
standby 1 timers 5 15
!
interface serial0
ip address <> <>
!
router eigrp 1
network 192.168.10.0
network 10.10.0.0
network <>
Router2 (secondary)
interface Ethernet0
ip address 192.168.11.3 255.255.255.0
ip address 10.10.0.2 255.255.255.0 secondary
standby 1 ip 10.10.0.3
standby 1 preempt
standby 1 priority 100
standby 1 authentication denmark
standby 1 timers 5 15
!
interface serial0
ip address <> <>
!
router eigrp 1
network 192.168.11.0
network 10.10.0.0
network <>
Thanks in advance
Cheers
Mohamed
03-18-2008 01:48 AM
Hi Mohamed,
First, the main question is, for which devices do you setup HSRP on the two routers? Where (PC, router, ...) do you configure 10.10.0.3?
The main reason to use HSRP is to have redundancy for devices, where a fixed IP address needs to be configured as default gateway. If there are no such devices connected to the LAN of the two routers, then it is unlikely that you need HSRP at all. Your dynamic routing protocol should take care of redundancy.
Second, are the two routers on a common LAN or not? If the answer is "No", then a common HSRP group does not make sense.
If the answer is "Yes", then I would have expected something like:
interface Ethernet0
ip address 192.168.10.2 255.255.255.0
ip address 192.168.11.2 255.255.255.0 secondary
standby 1 ip 192.168.10.1
standby 1 preempt
standby 1 priority 110
standby 1 authentication denmark
standby 1 timers 5 15
standby 2 ip 192.168.11.1 secondary
standby 2 preempt
standby 2 priority 110
standby 2 authentication denmark
standby 2 timers 5 15
!
Router2 (secondary)
interface Ethernet0
ip address 192.168.10.3 255.255.255.0
ip address 192.168.11.3 255.255.255.0 secondary
standby 1 ip 192.168.10.1
standby 1 preempt
standby 1 priority 100
standby 1 authentication denmark
standby 1 timers 5 15
standby 2 ip 192.168.11.1 secondary
standby 2 preempt
standby 2 priority 100
standby 2 authentication denmark
standby 2 timers 5 15
!
Hope this helps! Please rate all posts.
Regards, Martin
03-18-2008 04:45 AM
Hi Martin,
The HSRP will be setup on the two routers. The is a device (server) connected to these two routers..this server has two network card..one card (192.168.10.4)connected to the primary router and another (192.168.11.4) for the secondary router.
So, according to your configuration, the default gateway for the server will be 192.168.10.1 for 192.168.10.0 subnet & 192.168.11.1 for 192.168.11.0 subnet, is it right?? and that's it?? the server will switch to the secondary router once the primary router goes down?
Thanks to advise?
Thanks for your help
Mohamed
03-18-2008 05:41 AM
Hi Mohamed,
Yes, in the solution of Martin the GW for 10.x is 10.1 and for the 11.x will be the 11.1
Also take a notice of the preempt value at the Marin solution. If the router goes down, the second one will take over. If the failed router comes up, the active one will be the one with the highest preempt value.
Cheers
J
03-18-2008 05:43 AM
Hi,
If the server will be connected back-to-back to the two routers then one basic requirement of HSRP is not fulfilled: the common LAN segment between the two routers.
HSRP requires Hello packets to be sent through a Switch, which means both router interfaces must belong to the same VLAN.
If the two routers and the server are in one VLAN then the example config can work.
Regards, Martin
03-18-2008 05:52 AM
Hi Martin,
So, to implement the HSRP, we need to have a Switch behind...
Last concern, for the backup link..for cost issue,This not going to be used unless the primary link goes down (no routing packet should cross the backup link)..
is it enough with HSRP setup or do i need to tune the routing configuration on both routers.
Thanks to advise.
Appreciate your help
Cheers
Mohamed
03-18-2008 06:02 AM
Hi,
It depends on your EIGRP link metrics and EIGRP configuration, if one or the other or even both links are used - assuming EIGRP is used between the sites.
To make sure the backup link is only used, if the primary is down, you can use a higher "bandwidth
Hope this helps!
Regards, Martin
03-18-2008 06:25 AM
Hi Martin,
It's gonna be easier if we have one router with two links (primary & secondary)...
Is it the same for my case..One router with primary link and second router with back link..
i'm confused. Can you help me on.
Thanks in advance
Mohamed
03-18-2008 06:33 AM
Hi Martin,
It's gonna be easier if we have one router with two links (primary & secondary)...
Is it the same for my case..One router with primary link and second router with back link..
i'm confused. Can you help me on.
Thanks in advance
Mohamed
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