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Explorer

Redundancy link - Fiber & Microwave

hi,

We have an existing fiber link from 2 sites: Exchange 1 <---> Exchange 2

We would like to engage a contractor to supply us a secondary/redundant Microwave link; linking both sites.

If we have a single 2900 Series router at both sites.

Question is: what is the best method to provide redundancy OR load sharing for both fiber & microwave link?

Have not dealt with microwave link before; is there any special config that is needed on Cisco 2900 router side?

From my understanding; microwave vendor will be giving us a copper/RJ45 connection to our cisco 2900 router.

Please advise.

10 REPLIES 10
Advisor

Redundancy link - Fiber & Microwave

No special config needed. I have a customer than runs microwave. We also get an RJ-45 handoff so the whole thing is pretty transparent to us. We set it up more in an active/passive scenario. We have to L3 connections between the sites and adjusted the AD of the IGP so the dark fiber was preferred.

Hope it helps.

Beginner

Re: Redundancy link - Fiber & Microwave

Dear Concern,

 

We have two sites  A ------B both side has cisco l3 switch we make primary link with fiber

and backup with microwave would you please help me in this regard this is l2 link

Beginner

Re: Redundancy link - Fiber & Microwave

how could i make primary fiber path and secondary microwaves between two l3 switches

Beginner

Redundancy link - Fiber & Microwave

The mikrowave link provides a Layer 2 ethernet connection. A simple way to do the failover is using the spanning tree protocol of the switches where the fiber and the microwave links are connected. The bandwidth settings on the switch ports would be used to calculate the best path. It is necessary to change the bandwidth setting on the switch port in order to obtain the desired result.

It is possible also to do load balance with the MST protocol or by changing the port priority of the switch port on a particular vlan.

Redundancy link - Fiber & Microwave

i would recommend you to use L3 /30 p2p per link rather than L2 to avoid extending spanning tree and increasing the complexity unless L2 is required between the sites

using IGP or static routes with differnt administrative distance AD as Collin mentioned is the simplest way you can use

also you can use IP SLA to improve the static route and make it more network aware

http://www.cisco.com/en/US/docs/ios/12_3/12_3x/12_3xe/feature/guide/dbackupx.html

hope this help

Beginner

Redundancy link - Fiber & Microwave

I guess it depends on the requierements. Agree on L3 is effective by using routing different routing protocols and IP SLA. But if a requirement is to transport VLANS on a redundand environmet the network design changes.

Another protocol worth to take a look is UDLD

http://www.cisco.com/en/US/docs/switches/lan/catalyst3550/software/release/12.1_19_ea1/configuration/guide/swudld.html

Explorer

Re: Redundancy link - Fiber & Microwave

Thanks for all the input.

If we would like to do Redundancy AND Load balance.

Scenario: where load balancing is in place; if one of the two link is down, it will proceed to route to the active link. & when the dead link comes up it will resume its load balancing task.

Will the below method work?

  1. If i proceed to use 2 static routes with same AD =load balance
  2. And also Use ip sla tracking=failover

Will this achieve my objective?

Advisor

Re: Redundancy link - Fiber & Microwave

You have a couple of options. If both links are the same speed you could put them in a layer port channel. That would give you both LB and redundancy. Since it's doubtful that both links are the same speed you can create two L3 links and use IGP to determine LB and redundancy. You will have to tweak the AD on one of the links so they "look" like the same speed. If you're using EIGRP you can use variance.

http://www.cisco.com/en/US/tech/tk365/technologies_tech_note09186a008009437d.shtml

Contributor

Redundancy link - Fiber & Microwave

I woild have done as collin said

Regards
Thanveer
"Everybody is genius. But if you judge a fish by its ability to climb a tree, it will live its whole life believing that it is a stupid."

Re: Redundancy link - Fiber & Microwave

just to add to collin's post 5+

if you decide to go with static route i highly recommend you to use it with IP SLA to make sure smooth and quick failover and make it more topology aware routing

HTH

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