I am playing with a Cisco cBR-8, not live, in our lab, but soon to go live. I have modems working on it, but I'm not happy with a few things, the big one being below:
Its different enough to be annoying for me to have one problem that I can't figure out (so far!!)
Each linecard has 8 downstream ports and 16 upstream ports, so I figured I would use 2 upstream ports per downstream.
We do a fairly straightforward docsis environment, nothing trick at this time.
The first upstream port is set for 3 frequencies, and the second upstream port will be set for 3 frequencies as well, but here is where my problem is:
I cannot overlap frequencies between the 2 upstream ports.
I'm set to 26, 30 and 34mhz on the first upstream port, but on the second port, I can't be anywhere near those frequencies, because of overlapping frequencies, even though its a seperate port! It invalidates the fiber node.
Here are a couple things from my config, can anyone tell me what I'm missing?
*******************************
controller Upstream-Cable 0/0/0
us-channel 0 frequency 30000000
us-channel 0 channel-width 3200000 3200000
us-channel 0 docsis-mode tdma-atdma
us-channel 0 minislot-size 4
us-channel 0 modulation-profile 123
us-channel 0 equalization-coefficient
no us-channel 0 shutdown
us-channel 1 frequency 34000000
us-channel 1 channel-width 3200000 3200000
us-channel 1 docsis-mode tdma-atdma
us-channel 1 minislot-size 4
us-channel 1 modulation-profile 123
us-channel 1 equalization-coefficient
no us-channel 1 shutdown
us-channel 2 frequency 26000000
us-channel 2 channel-width 3200000 3200000
us-channel 2 docsis-mode tdma-atdma
us-channel 2 minislot-size 4
us-channel 2 modulation-profile 123
us-channel 2 equalization-coefficient
no us-channel 2 shutdown
**************************
controller Upstream-Cable 0/0/8
us-channel 0 frequency 38000000
us-channel 0 channel-width 3200000 3200000
us-channel 0 docsis-mode tdma-atdma
us-channel 0 minislot-size 4
us-channel 0 modulation-profile 123
us-channel 0 equalization-coefficient
no us-channel 0 shutdown
*********************************
interface Cable0/0/0
downstream Integrated-Cable 0/0/0 rf-channel 0-7
upstream 0 Upstream-Cable 0/0/0 us-channel 0
upstream 1 Upstream-Cable 0/0/0 us-channel 1
upstream 2 Upstream-Cable 0/0/0 us-channel 2
upstream 3 Upstream-Cable 0/0/8 us-channel 0
cable bundle 1
************************************
cable fiber-node 1
downstream Integrated-Cable 0/0/0
upstream Upstream-Cable 0/0/0
upstream Upstream-Cable 0/0/8
upstream sg-channel 1 3 Upstream-Cable 0/0/0 us-channel 1 3
upstream sg-channel 0 Upstream-Cable 0/0/8 us-channel 0
!
I'm missing something, and I haven't been able to find anything on Cisco pointing me in the right direction.
Thanks in advance..
ODG
I may very well be misunderstanding your explanation and your config... My reading of what you are saying is that you are trying to configure the 2nd upstream port to the same channels as the first upstream port and that both ports are connected to the same fiber node. That should not work, at least as I understand it. You can reuse those frequencies on a different node but not the same node.
You aren't misunderstanding me, and you are right. It was such a noob thing I was trying to force these 2 different ports into a single fiber node.
I read this last night and immediately knew how to fix it.
Thanks!
I haven't seen the CBR8, so I can't really comment on the command line, but on the 10K with 3G60V cards, there is no problem with assigning adjacent physical ports with the same frequency. One thing I don't see in your example is a 'connector assignment' or similar statement:
(snipped from my 3GX60V line card setup)
...
cable upstream 0 connector 0
cable upstream 0 frequency 24900000
cable upstream 0 channel-width 3200000 3200000
cable upstream 0 load-balance group 60
cable upstream 0 description "Node 34 Woods at Stoney Ridge"
cable upstream 0 docsis-mode atdma
cable upstream 0 minislot-size 2
cable upstream 0 range-backoff 3 6
cable upstream 0 modulation-profile 224
cable upstream 0 equalization-coefficient
no cable upstream 0 shutdown
cable upstream 1 connector 0
cable upstream 1 frequency 29800000
cable upstream 1 channel-width 6400000 3200000
cable upstream 1 load-balance group 60
cable upstream 1 description "Node 34 Woods at Stoney Ridge(1)"
cable upstream 1 docsis-mode atdma
cable upstream 1 minislot-size 2
cable upstream 1 range-backoff 3 6
cable upstream 1 modulation-profile 224
cable upstream 1 equalization-coefficient
no cable upstream 1 shutdown
I do the same thing on all my other cmts's, including the mc88 on my 7246's, the 20x20 cards and the 3g60 cards.
However, the linecards on the cbr-8 don't have connecter commands, believe me, I looked!
Lab-CBR8#config t
Enter configuration commands, one per line. End with CNTL/Z.
Lab-CBR8(config)#controller upstream-Cable 0/0/0
Lab-CBR8(config-controller)#us-channel ?
<0-11> Upstream channel number
Lab-CBR8(config-controller)#us-channel 0 ?
channel-width Channel width in HZ
description Upstream name/description
docsis-mode upstream channel docsis mode
equalization-coefficient Enable equalization coefficient
frequency Frequency
hop-priority Hopping Criteria
ingress-noise-cancellation Enable or disable ingress noise cancellation
max-logical-chans Max num of logical chans per port
minislot-size Minislot size
modulation-profile Modulation Profile Number
power-level Input power level
shutdown Shutdown the upstream channel
specsvl Spectrum surveillance
spectrum-group Set spectrum group
threshold Spectrum Management thresholds
Lab-CBR8(config-controller)#
Its a different animal, thats for sure.
However, by modifying my fiber-node and adding another one, I have it working.
Now, off to mess with upstream bonding!
Thank you guys!!