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Beginner

disable B mode at W877 and increase wireless blink stability.

Hi guys.

 

I have setup cisco 877w connected in non root bridge mode to other non cisco wireless N router (I don't have administrative access to it). I'd like to disable B mode at 877w router and increase link statility

Current configuration:

=========

interface Dot11Radio0
description -= outside WBR 2 management AP =-
ip address dhcp
ip access-group di_in in
ip nat outside
ip inspect dial out
ip virtual-reassembly in
ip tcp adjust-mss 1360
!
encryption mode ciphers aes-ccm
!
ssid PS-mgmt
!
speed basic-1.0 basic-2.0 basic-5.5 6.0 9.0 basic-11.0 12.0 18.0 24.0 36.0 48.0 54.0
packet retries 24 drop-packet
station-role non-root
antenna gain 0
crypto ipsec df-bit clear
=========

 

Could you suggest if bellow is right code to disable B mode channel?

======

speed basic-12.0 18.0 24.0 36.0 48.0 54.0

======

Also is it good idea to enable short preamble (by enabling "short-slot-time")? maybe somebody can suggest "best practices" methods to increase link stability? Distance between management AP and 877w router no more 10-15 meters. Open space. signal strength 59-67 dbm. c877w and management AP have installed two omni direction (unfortunately) 8dbm antennas:

 

c877w association info:

======

gate-ctr745(config-if)#do sh dot11 ass all
Address : 6e12.5161.a46c Name : NONE
IP Address : 0.0.0.0 Interface : Dot11Radio0
Device : unknown Software Version : NONE
CCX Version : NONE

State : Assoc Parent : Our Parent
SSID : PS Campers VLAN : 0
Hops to Infra : -1 Association Id : 297
Tunnel Address : 0.0.0.0
Key Mgmt type : WPAv2 PS Encryption : AES-CCMP
Current Rate : 54.0 Capability : WMM ShortHdr ShortSlot
Supported Rates : 1.0 2.0 5.5 6.0 9.0 11.0 12.0 18.0 24.0 36.0 48.0 54.0
Signal Strength : -61 dBm Connected for : 82254 seconds
Signal Quality : N/A Activity Timeout : 15 seconds
Power-save : Off Last Activity : 0 seconds ago

Packets Input : 246103 Packets Output : 306290
Bytes Input : 97304626 Bytes Output : 73647712
Duplicates Rcvd : 9773 Data Retries : 81648
Decrypt Failed : 0 RTS Retries : 0
MIC Failed : 0 MIC Missing : 0
Packets Redirected: 0 Redirect Filtered: 0

gate-ctr745(config-if)#

======

data retries counters increasing and once in ~1 hour I link drop down with "Too many retries" error notification:

======

068353: Aug  7 14:02:06: %DOT11-4-UPLINK_DOWN: Interface Dot11Radio0, parent lost: Too many retries

======

 

Thank you.

Everyone's tags (3)
2 REPLIES 2
VIP Mentor

Re: disable B mode at W877 and increase wireless blink stability.

Could you suggest if bellow is right code to disable B mode channel?

======

speed basic-12.0 18.0 24.0 36.0 48.0 54.0

======

1,2,5,5 & 11 Mbps are 802.11b  rates which use DSSS modulation. 6 & 9 Mpbs is  use OFDM & part of 802.11g rates.

 

In your case, it is ok to disable 6 & 9 Mbps as well & go with what you came  up with.

Ideally you need to set it at Root AP level to avoid any mismatch of basic rates.

 

Also is it good idea to enable short preamble (by enabling "short-slot-time")? maybe somebody can suggest "best practices" methods to increase link stability? 

does it got dual band radio/antenna ? If so, I would use 5GHz for a stability & higher performance. I would not suggest to enable short preamble

 

HTH

Rasika

*** Pls rate all useful responses ***

Beginner

Re: disable B mode at W877 and increase wireless blink stability.

 

I see. Thank you Rasika.

 

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