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Beginner

Suitable Router model for handle 15 Multicast Streams

We have a requirement to handle 15 multicast streams. Currently, we configured PIM configurations on our existing backbone. So, I need to find a suitable router to cater to 15 multicast streams. I selected the Cisco 3925 and Cisco 2951 router. Please suggest a suitable router for the above requirement and what are the limitations of my selection. If the Cisco 3925 router is used for the above requirement how it impacts to the router performance (with 15 multicast streams).

 

10 REPLIES 10
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Hall of Fame Expert

What's the packets per second and typical bits per second for each multicast stream?

How many egress interfaces will each stream need to be sent out on?

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Dear Joseph,

Thanks for your prompt response. 


What's the packets per second and typical bits per second for each multicast stream?

4 Mbps

How many egress interfaces will each stream need to be sent out on?

3 or 4 interfaces 

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Don't know PPS for those streams?

Reason I ask, ISR performance varies, for same bps, depending on PPS.

If you don't know, we'll assume worst case?

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Dear Joseph,

Again thanks for your support. Currently, we have used 3925 router and enabled 11 Multicast stream. But I want to find a suitable router to handle 15 Multicast streams without impact to the router performance CPU, memory and etc. Please find the one of our routers multicast information. Could please suggest suitable router model to handle 15 Multicast streams. 

 

Group: 224.1.1.247, (?)
Source: 10.10.10.18 (?)
Rate: 1396 pps/4513 kbps(1sec), 4513 kbps(last 10 secs), 4512 kbps(life avg)


Group: 224.11.4.94, (?)
Source: 10.0.5.70 (?)
Rate: 197 pps/2118 kbps(1sec), 2118 kbps(last 20 secs), 2118 kbps(life avg)

 

Group: 224.1.1.26, (?)
Source: 10.10.10.5 (?)
Rate: 399 pps/4294 kbps(1sec), 4294 kbps(last 20 secs), 3500 kbps(life avg)

 

Group: 224.1.1.28, (?)
Source: 10.10.10.2 (?)
Rate: 380 pps/4085 kbps(1sec), 4085 kbps(last 40 secs), 4084 kbps(life avg)

 

Group: 224.1.1.5, (?)
Source: 10.10.10.12 (?)
Rate: 379 pps/4080 kbps(1sec), 4080 kbps(last 10 secs), 4085 kbps(life avg)

 

Group: 224.1.1.9, (?)
Source: 10.10.10.13 (?)
Rate: 474 pps/5105 kbps(1sec), 5105 kbps(last 20 secs), 4960 kbps(life avg)

 

Group: 224.1.1.8, (?)
Source: 10.10.10.2 (?)
Rate: 417 pps/4492 kbps(1sec), 4492 kbps(last 40 secs), 4378 kbps(life avg)

 

Group: 224.1.1.10, (?)
Source: 10.10.10.14 (?)
Rate: 380 pps/4089 kbps(1sec), 4089 kbps(last 20 secs), 3936 kbps(life avg)

 

Group: 224.1.1.80, (?)
Source: 10.10.10.16 (?)
Rate: 380 pps/4085 kbps(1sec), 4085 kbps(last 0 secs), 4083 kbps(life avg)

 

 

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Great stats!

If you're using the 3925 now, what does its CPU performance history look like when those multicast streams are active?

Cisco, to my knowledge, doesn't document multicast performance.  However, I'm supposing we might consider each ingress stream, and one of its egress streams, CPU impact, somewhat similar to a like unicast stream.  I'm also further supposing we might consider every additional egress stream equal to about half of a like unicast stream.  (BTW, note carefully, again, I'm supposing.)

Possibly better, in your case, we can figure out the impact of an average mulicast stream on your 3925. Besides possibly scaling this on the 3925, we might also be able to scale this to other routers knowing their performance relative to your 3925.

I've attached two Cisco performance documents.  Again, if you look at the 3925's performance, we should be able to (somewhat) scale it relative to other routers.  Notice, those, these documents don't have the later ISRs, like the 4K series.  For those, except when using the boost license, they will generally always support their bandwidth caps (often) regardless of traffic mix or your configuration.  (For multicast, I'm not positive, but I think they base cap on ingress, not egress.)

Here are the sum and average of 1st column's stats:

Rate: 1396 pps/4513 kbps(1sec), 4513 kbps(last 10 secs), 4512 kbps(life avg)
Rate: 197 pps/2118 kbps(1sec), 2118 kbps(last 20 secs), 2118 kbps(life avg)
Rate: 399 pps/4294 kbps(1sec), 4294 kbps(last 20 secs), 3500 kbps(life avg)
Rate: 380 pps/4085 kbps(1sec), 4085 kbps(last 40 secs), 4084 kbps(life avg)
Rate: 379 pps/4080 kbps(1sec), 4080 kbps(last 10 secs), 4085 kbps(life avg)
Rate: 474 pps/5105 kbps(1sec), 5105 kbps(last 20 secs), 4960 kbps(life avg)
Rate: 417 pps/4492 kbps(1sec), 4492 kbps(last 40 secs), 4378 kbps(life avg)
Rate: 380 pps/4089 kbps(1sec), 4089 kbps(last 20 secs), 3936 kbps(life avg)
Rate: 380 pps/4085 kbps(1sec), 4085 kbps(last 0 secs), 4083 kbps(life avg)
===================
4,402 pps & 36,861 kbps
   489 pps &   4,096 kbps (averages)

Once you can (sort of) figure the "average" CPU impact, per multicast stream, (hopefully) we can scale it for both your 3925 and other Cisco routers.

Oh, lastly, on many Cisco ISR, add-on Ethernet port modules cannot deliver the same performance as built-in Ethernet ports.

 

PS:

Oops, forgot the attachments.

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Dear Joseph,

 

I appreciate your quick response on this matter. I have mentioned below the CPU process information of our 3925 routers with 11 multicast streams. Based on the below result could you please suggest the best router for my requirement? (3925 or another model)

 

CPU utilization for five seconds: 21%/19%; one minute: 20%; five minutes: 20%
PID Runtime(ms) Invoked uSecs 5Sec 1Min 5Min TTY Process
6 72701184 10447003 6959 0.55% 0.09% 0.06% 0 Check heaps
33 118262948 2132554630 55 0.23% 0.18% 0.16% 0 ARP Input
109 288232 274167603 1 0.15% 0.16% 0.15% 0 Netclock Backgro
389 11215416 105853189 105 0.15% 0.03% 0.00% 0 OSPF-10 Router
197 254188 109946774 2 0.15% 0.12% 0.13% 0 Ethernet Msec Ti
90 7432892 72634011 102 0.15% 0.15% 0.15% 0 Per-Second Jobs
400 76 675 112 0.07% 0.02% 0.00% 648 Virtual Exec
176 60165260 989538048 60 0.07% 0.06% 0.06% 0 IP Input
172 45776 2138458252 0 0.07% 0.01% 0.00% 0 IPAM Manager
131 50816 1070953188 0 0.07% 0.02% 0.00% 0 VRRS Main thread
126 2404124 140871406 17 0.07% 0.03% 0.03% 0 BPSM stat Proces
375 72656 3419657777 0 0.07% 0.04% 0.05% 0 MFIB_mrib_write
279 2750540 1545141132 1 0.07% 0.03% 0.02% 0 PIM Process
391 7721252 296298190 26 0.07% 0.01% 0.00% 0 OSPF-10 Hello
213 247064 68743960 3 0.07% 0.02% 0.00% 0 ADJ background
15 2096 66932839 0 0.00% 0.00% 0.00% 0 BGP Scheduler
16 72152984 68467946 1053 0.00% 0.07% 0.05% 0 Environmental mo
14 0 1 0 0.00% 0.00% 0.00% 0 OIR Handler

 

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222222222222222222222222422222222222222222222222222222222222
201110101121011201012100011011211010121110122101121000010000
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CPU% per minute (last 60 minutes)
* = maximum CPU% # = average CPU%




422222222222222222222222422222222222222222226222322222222222222222223222
033221211126233332332322023321121129333222232733022221111224322335330333
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0 5 0 5 0 5 0 5 0 5 0 5 0

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If those CPU stats are with the nine multicast streams active, and you want to add another six like them, I believe your 3925 will be fine.

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Dear Joseph,


Thanks for your prompt support as always

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You're most welcome, and if you could, post a follow-up whether the 3925 was sufficient or not.

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Beginner

can I use cisco 3925 to handle 15 Multicast streams ( Each 4Mbps)