cisco VS juniper VRRP

[dabur10376004]

Hi

we have two senario as below.

we have cisco 4510R+E & Juniper switch. we need to run VRRP between them for redundency. its connectivity is as below

cisco 4510 10Gb connect with juniper 10Gb so we can get 20 Gb or 10 Gb?

we have 2 nos of cisco 4510R+E ,we need to run VSS between them for redundency. its connectivity is as below

Cisco 4510 10Gb connect with another cisco 4510 10Gb so we can get 20 Gb or 10 Gb?

another question, which scenario will be best for us. based on that we will procure juniper or another cisco 4510

kindly suggest on priority basis.

[Philip D'Ath]

You come to a Cisco support form and ask if you should buy Juniper?  Why would you even want to introduce multi-vendor complexity into your network.

A single 10Gb/s link provides 10Gb/s in each direction, for a total of 20Gb/s of bandwidth.  If you are considering VSS you really should be using at least two links between the switches for redundancy.

[dabur10376004]

thanks for your reply.

please confirm on below point.

Q1.  Cisco 4510 2 nos of 10Gb connect with juniper 2 nos of 10Gb & running VRRP , can we get total bandwidth 20 Gb or 10 Gb?

Q2.  Cisco 4510 2 nos of 10Gb connect with another Cisco 4510 2 nos of 10Gb & running VSS,can we get total bandwidth 20 Gb or 10 Gb?

could you Please provide some pros & cons on both scenario. it would be helpful for us.

Thanks

[InayathUlla Sharieff]

Q1.  Cisco 4510 2 nos of 10Gb connect with juniper 2 nos of 10Gb & running VRRP , can we get total bandwidth 20 Gb or 10 Gb?

Answer:- At any given point of time you only get 10GB output. Let me give you example:

suppose you are connecting 2 10Gig link between the switches you are achieving kind of load/sharing and any given point of time traffic will be flowing through only one link.The only advantage is that you have is that when you do etherchannel which means bundling of two link itto one. In that case STP will see 2 links as 1 which would avoid one of the Port going into blocking if you dont have Port channel.

VRRP is the protocol used for redundancy and not for any increasing of bandwidth.

Q2.  Cisco 4510 2 nos of 10Gb connect with another Cisco 4510 2 nos of 10Gb & running VSS,can we get total bandwidth 20 Gb or 10 Gb?

Answer:- Please read our what is VSS that would help you in understanding. VSS is nothing but have two physical chasis bundling ito one. Still you dont get the bandwidth of 20gig.

Here is the explanation of what VSS is:-

https://supportforums.cisco.com/document/124626/virtual-switching-system-vss-configuration-cisco-4500-series-switches

could you Please provide some pros & cons on both scenario. it would be helpful for us.

Pros:- VSS has lot of advantage.

Thanks

Inayath

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[dabur10376004]

thanks for your prompt support.

I am just concern more about uplink bandwidth if we are adding 2 nos of 10G port each.

Actually I am just confusing that if different vendor switches (cisco & juniper) are connecting to each other like uplink (10Gx2port each). in that case uplink bandwidth will be 20 Gb or 10Gb if we are making ether channel between them.

if we are using cisco switches & connecting to each other like uplink (10Gx2port each). in that case uplink bandwidth will be 20 Gb or 10Gb if we are making ether channel between them.

[InayathUlla Sharieff]

Theoratically or sales point of view saying is bandwidth 20Gig.

But actually it will be 10 gig. 

Remember this:

4500-===two link of 10 gig ===4500

Now as you see 10 gig connectivity ( 10*2=20gig) output is the theoritically way of explaining. But when the traffic flows from one 4500 to 2nd 4500 the traffic will be flown only through one link hence only at any given point of time you can send 10gig of traffic only.

question:

if we are using cisco switches & connecting to each other like uplink (10Gx2port each). in that case uplink bandwidth will be 20 Gb or 10Gb if we are making ether channel between them.

Answer:-When you bundle that doesnt mean that the bandwidth will be 20gig. Its wrong way of explanation. If you want to achieve 20gig then you need to increase the bandwidth. 

HTH

[dabur10376004]

thanks for your response.

[Joseph W. Doherty]

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When you bundle multiple Ethernet ports (which can often be done even between different vendors using LACP), you have more aggregate bandwidth; the bandwidth sum of all your ports.  However, also often, individual flows will only use a single port, and if so, the maximum bandwidth for a single flow is the bandwidth of a single port.

So, for a pair of Cisco 10g ports, Etherchanneled, multiple flows can take advantage of the 20 gig, but any one flow will not be able to obtain more than 10 gig.

Also with bundled Ethernet ports, Cisco hardware doesn't take into account actual port loading, so two or more flows might use one port, while the adjacent port is even totally unused.  Even with multiple flows, you seldom will see multiple flow bandwidth take full advantage of all the aggregate bandwidth.  I've found, for two links, multiple flows get about a 50% bandwidth boost, not the 100% you would hope for.  I.e. in average, two 10g Etherchannel links will perform somewhat like a single 15g link.

Lastly, when working with Etherchannel, it's important to insure the hashing algorithm being used well distributes your traffic.  A "bad" choice can cause all your traffic to use just one link.  (If supported, hashing both source and destination IP addresses often works well.)