System Bandwidth

[imstha001]

I have just quick question .

What is the actual meaning of following :

default system bandwidth of 5 Gbps, upgradable to 10 Gbps, 20 Gbps, or 36 Gbps with a software-activated upgrade license.

Pls if anyone has idea about it.

[Philip D'Ath]

I'm guessing you are talking about the ASR's.

The hardware on these systems are capable of very high throughputs.  The actual throughput is software limited to a specific value based on the licence you have paid for.

So it might come with a 5Gb/s licence.  If you need more punch, you can buy a 10Gb/s licence, apply it, and voila, you have more throughput.

[imstha001]

Thanks Phillip,

Just wondering how it is calculated. We are using 3 10gig interface and incoming\outgoing  traffic from two link is 3GBPS\0.5GBPS.

and remaining 10 gig interface is connected to distribution layer network.

[Philip D'Ath]

My understanding is it is the total bandwidth flowing in and out both directions.  So if you had an interface with a 5Gb/s symmetric flow, you would need 10Gb/s of bandwidth licence.

More specifically, if you had 2 interface.  And 5Gb/s flows in one interface and out another - that counts as 5Gb/s (think flow).  If you then had 5Gb/s of return traffic come in one interface and go out another you would now be up to 10Gb/s of flows.

[Joseph W. Doherty]

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Posting

From another recent post, with a similar question, it appears the ASR counts all interface egress bandwidth.  If the egress aggregate sum exceeds the bandwidth cap, some traffic will be dropped to keep the egress aggregate within the bandwidth cap (much like a policer does).

Normally you think of ingress and egress bandwidth being the same, multicast replication can have much more egress than ingress.  Again, it's the egress that's counted.