Cisco Support Community
cancel
Showing results for 
Search instead for 
Did you mean: 
Community Member

Backup link ?

Hi ive got two sites with a cisco router at each, we primarly use our main lease line for normal operation which is connected via the fa0/1/3 port on each router. if the line goes down then we have another leased line we can manually switch to which is connected via S0/0/0 of each router. My question is what feature could i use to create an automatic failover to the line connected on the s0/0/0 ports?

many thanks

jonathan

8 REPLIES

Re: Backup link ?

Hi Jonathan, [pls rate if helps]

It depends on what Routing behaviour you need to acheive. You can use Some routing protocols.

Sample recomm....

For the first site you can Use Eigrp adv.. & for the second site you can use Static route with AD more than the normal.

You can also use OSPF & vary the Pri, Sec using Cost Factor.

Pls Rate if Helps

Best Regards,

Guru Prasad R

Re: Backup link ?

Hi,

As Guru said, if your are just using static routes, you can use a floating static route (a static route with a higher AD) for backup:

ip route 0.0.0.0 0.0.0.0 fa0/1/3

ip route 0.0.0.0 0.0.0.0 S0/0/0 254

HTH, please do rate all helpful replies,

Mohammed Mahmoud.

Community Member

Re: Backup link ?

hi mohammedmahmoud thank you for your reply, so i just edit/create the static routes on each router using your commands displayed above (i guess i subistute the appropiate ip addresses in where youve put 0.0.0.0) and the 254 youve added on to the end of "ip route 0.0.0.0 0.0.0.0 S0/0/0 ", does that set the AD higher?

many thanks

jonathan

Re: Backup link ?

HI Jonathan,

AD means Administrative distance.

"254" - is an integer to increase the AD for the second static route (for failover). Whereas primary static route will not have any AD - it will be default.

PLs rate if Helps

Best Regards,

Guru Prasad R

Re: Backup link ?

Hi Jonathan,

You are correct, 254 is the AD (the highest available AD, to make sure that this route is always backup whatever the routing protocol of the main route).

I hope that i've been informative, and please never hesitate before asking any question.

HTH, please do rate all helpful replies,

Mohammed Mahmoud.

Community Member

Re: Backup link ?

sounds promising i know what eigrp is but whats eigrp adv (im only ccna trained with some experience of CCNP). with the other site AD is that administritive distance?

kind regards

jonathan

Re: Backup link ?

HI Jonathan,

Site1 - via Primary - to Site2 = Eigrp

Site1 - via Backup - to Site2 = Static Route

Eigrp Adv means Eigrp advertisements. Link1 to use the Eigrp protocol between two sites.

LInk2 to use the Static route between two sites with AD as 254.

Note:Floating Static Routes will help you more to fix your requirement

Pls Rate if Helps

Best Regards,

Guru Prasad R

Hall of Fame Super Gold

Re: Backup link ?

Jonathan

I believe that eigrp adv is eigrp advertisement. And AD is administrative distance.

I would suggest an approach slightly different from my colleagues. If you are going to run EIGRP as a dynamic routing protocol between the 2 sites then I would suggest running EIGRP on both links, and if necessary adjusting the metric to establish a primary path and a backup path. The advantage here is that you do not need any manually configured static routes and the failover will be more effective.

HTH

Rick

127
Views
0
Helpful
8
Replies
CreatePlease to create content