| Attachment | Size |
|---|---|
 cacti graph for interface Wideband-Cable5/0/0:0 | 30.96 KB |
| cacti graph for interface Wideband-Cable5/0/0:1 | 31 KB |
| cacti graph for interface Wideband-Cable5/0/0:2 | 30.56 KB |
 WB_load balance.txt | 6.26 KB |
Hi,
We have segments with 20 DS channels and with 4 WB groups which configured as listed below.
all DS are primary channels and spread across multiple mac-domains
interface Wideband-Cable5/0/0:0
load-interval 30
cable bundle 1
cable rf-channel 0 bandwidth-percent 1
cable rf-channel 1 bandwidth-percent 1
cable rf-channel 2 bandwidth-percent 1
cable rf-channel 3 bandwidth-percent 1
cable rf-channel 4 bandwidth-percent 1
cable rf-channel 5 bandwidth-percent 1
cable rf-channel 6 bandwidth-percent 1
cable rf-channel 7 bandwidth-percent 1
interface Wideband-Cable5/0/0:1
load-interval 30
cable bundle 1
cable rf-channel 8 bandwidth-percent 1
cable rf-channel 9 bandwidth-percent 1
cable rf-channel 10 bandwidth-percent 1
cable rf-channel 11 bandwidth-percent 1
cable rf-channel 12 bandwidth-percent 1
cable rf-channel 13 bandwidth-percent 1
cable rf-channel 14 bandwidth-percent 1
cable rf-channel 15 bandwidth-percent 1
interface Wideband-Cable5/0/0:2
load-interval 30
cable bundle 1
cable rf-channel 12 bandwidth-percent 1
cable rf-channel 13 bandwidth-percent 1
cable rf-channel 14 bandwidth-percent 1
cable rf-channel 15 bandwidth-percent 1
cable rf-channel 16 bandwidth-percent 1
cable rf-channel 17 bandwidth-percent 1
cable rf-channel 18 bandwidth-percent 1
cable rf-channel 19 bandwidth-percent 1
and additional WB group with all the 20 rf-channels.
we are facing a strange phenomenon where the DOCSIS3.0 cable modems are not being balanced correctly.
Most of the DOCSIS3.0 cable modems are being locked on the first WB group.
show cable mac-domain cable 5/0/0 rcc
RCC-ID RCP RCs MD-DS-SG CMs WB/RCC-TMPL
1 00 00 00 00 00 8 0 75 WB (Wi5/0/0:0)
2 00 00 00 00 00 8 0 31 WB (Wi5/0/0:1)
3 00 00 00 00 00 8 0 29 WB (Wi5/0/0:2)
4 00 00 00 00 00 20 0 1 WB (Wi5/0/0:3)
show cable mac-domain cable 5/0/1 rcc
RCC-ID RCP RCs MD-DS-SG CMs WB/RCC-TMPL
1 00 00 00 00 00 8 0 87 WB (Wi5/0/0:0)
2 00 00 00 00 00 8 0 27 WB (Wi5/0/0:1)
3 00 00 00 00 00 8 0 47 WB (Wi5/0/0:2)
4 00 00 00 00 00 20 0 1 WB (Wi5/0/0:3)
due to the mentioned above we are facing unequaled traffic across the WB interfaces.
interface Wi5/0/0:0 is much more loaded.
attached you can find utilization graphs and the load balancing and fiber-node configuration.
has someone faced a similar behavior and solve it?
Thanks in advance,
Asaf
Try this
cable fiber-node 9
description interface Cable5/0/0
downstream Modular-Cable 5/0/0 rf-channel 0-19
upstream Cable 5/0 connector 0-3
cable load-balance rule 10 enabled
cable load-balance docsis-policy 10 rule 10
cable load-balance docsis-group FN 9 MD Cable5/0/0
no disable
method modems us-method modems
threshold load 10
threshold load minimum 5
threshold stability 50
threshold ugs 70
threshold pcmm 70
no policy ugs
no policy pcmm
no policy us-across-ds
no policy pure-ds-load
init-tech-list 4
docsis-policy 10
interval 30
Add "CMLoadBalancingPolicyID 10" to config file, and you have to restart all cm on this fiber node and check
sh cab modem c5/0/0 ver | i LB
Hi,
Can you please emphasize a bit regarding the rule you and policy you configured?
What should this rule should do?
Regarding your fiber-node we are working in a template which every connector gets it own fiber-node...
Thanks,
Asaf
Just checking I understand your design :
1/ Modular-cable 5/0/0 DS channels 0-19 are feeding to an 6-way optical or coax splitter. So nodes 1-6 are seeing the same set of DS channels.
2/ Nodes 1 to 6 each come back to their own upstream connectors on linecard 5/0
3/ Nodes 1-2 are configured on mac-domain 5/0/0, nodes 3-4 on 5/0/1, nodes 5-6 on 5/0/2
If above is correct then the descriptions in your fiber-node stanzas seem to be wrong.
Probably should be :
cable fiber-node 1
description interface Cable5/0/0
cable fiber-node 2
description interface Cable5/0/0
cable fiber-node 3
description interface Cable5/0/1
cable fiber-node 4
description interface Cable5/0/1
cable fiber-node 5
description interface Cable5/0/2
cable fiber-node 6
description interface Cable5/0/2
Other than that, nothing obvious jumps at me as invalid in your config. But its hard to tell as you have only supplied a few fragments.
Are the modular channels contiguous frequency?
Does the modem distribution problem improve if you activate docsis 2.0 load balance?
(Below assumes you have activated 3 x US per node...)
cable load-balance docsis-group 5000
downstream modular-cable 5/0/0 rf-channel 0-2
downstream modular-cable 5/0/0 rf-channel 8-9
downstream modular-cable 5/0/0 rf-channel 16-17
upstream cable 5/0/0 0-2
cable load-balance docsis-group 5001
downstream modular-cable 5/0/0 rf-channel 0-2
downstream modular-cable 5/0/0 rf-channel 8-9
downstream modular-cable 5/0/0 rf-channel 16-17
upstream cable 5/0/0 3-5
cable load-balance docsis-group 5010
downstream modular-cable 5/0/0 rf-channel 3-5
downstream modular-cable 5/0/0 rf-channel 10-12
downstream modular-cable 5/0/0 rf-channel 18
upstream cable 5/0/1 0-2
cable load-balance docsis-group 5011
downstream modular-cable 5/0/0 rf-channel 3-5
downstream modular-cable 5/0/0 rf-channel 10-12
downstream modular-cable 5/0/0 rf-channel 18
upstream cable 5/0/1 3-5
cable load-balance docsis-group 5020
downstream modular-cable 5/0/0 rf-channel 6-7
downstream modular-cable 5/0/0 rf-channel 13-15
downstream modular-cable 5/0/0 rf-channel 19
upstream cable 5/0/2 0-2
cable load-balance docsis-group 5021
downstream modular-cable 5/0/0 rf-channel 6-7
downstream modular-cable 5/0/0 rf-channel 13-15
downstream modular-cable 5/0/0 rf-channel 19
upstream cable 5/0/2 3-5
Not related to load-balance, but more of a general efficiency point :
Do you really need to have every channel primary?
There is quite a bit of overhead / waste for each primary.
Reducing the number of primary channels save you bandwidth.
Eg if you had few D1.1 / 2.0 modems, then you could reduce it to something like 1 in 8 eg :
* 5/0/0 could have primary 0,8,16
* 5/0/1 could have primary 1,9,17
* 5/0/2 could have primary 2,10,18
Hi,
sorry for the late response....
first of all you understood the design perfectly.
the docsis2.0 load balancing is enabled as well and being configure by d20-ggrp-default settings.
regarding the modular channels contiguously please find below
rf-channel 0 frequency 111000000
rf-channel 1 frequency 117000000
rf-channel 2 frequency 129000000
rf-channel 3 frequency 135000000
rf-channel 4 frequency 141000000
rf-channel 5 frequency 147000000
rf-channel 6 frequency 153000000
rf-channel 7 frequency 159000000
rf-channel 8 frequency 177000000
rf-channel 9 frequency 183000000
rf-channel 10 frequency 189000000
rf-channel 11 frequency 195000000
rf-channel 12 frequency 201000000
rf-channel 13 frequency 207000000
rf-channel 14 frequency 213000000
rf-channel 15 frequency 219000000
rf-channel 16 frequency 225000000
rf-channel 17 frequency 231000000
rf-channel 18 frequency 237000000
rf-channel 19 frequency 249000000
meaning that for each wideband group of 8 DS channels the frequencies are contiguous.
Regards,
Asaf
Hello
What is the behavior of docsis 1/2 modems ?
Number of narrow frequencies is the same for all the downstreams?
There is maybe a priority for Narrow repartition against wideband?