ATM QoS on 877

Hi,

I'm having a bit of trouble in getting the full bandwith on an IPoATM connecion ( ADSL w/ LLC encapsulation)

I've setup the ATM0 interface and bridged it to the BVI1 interface. So far so good. Got a lan configured also and NAT is doing ok.

However I'm getting a much lower bandwith then with the ISP supplied modem. With the Thompson SpeedTouch modem I can transfer @ about 720KBs but with the 877 I can't pass the 320KBs

Called the ISP support, who said that the 877 was not a supported equipment, but they gave me some usefull(?) PCR: 4000 SCR: 4000 QoS type UBR MBS: 10

I read a bit about this and I now I have minimal understanding how this affects speed in a link. My troube now is how to tell te 877 to use these values.

The only way I found to specify the pcr and scr was trough the vbr-nrt command on the config-if-atm-vc this is where I got stuck

#vbr-nrt 4000 4000 10 should do it, right? but the maximum value I can use is 747

c877(config-if-atm-vc)#vbr-nrt ? Peak Cell Rate(PCR) in Kbps

this rate limit also apears on ubr and ubr+

and can be checked on the interface

c877#show int atm0 ATM0 is up, line protocol is up Hardware is MPC ATMSAR (with Alcatel ADSL Module) Description: --- ADSL to ISP --- MTU 4470 bytes, sub MTU 4470, BW 747 Kbit, DLY 490 usec, reliability 255/255, txload 1/255, rxload 1/255

Then I tried a different approach, to set-up a vc-class in global config and tried to apply it to the pvc, but this is what i got

c877(config)#int atm0 c877(config-if)#pvc 0/35 c877(config-if-atm-vc)#class-vc vdf Insufficient bandwidth on interface or invalid PCR. Available bandwidth = 747

I guess this is the way, cos when I reduce the rate to, let's say 100, the download speed drops to about 40KBs right away.

How can solve this? How can I raise the "Available bandwidth" value?

Thanks

Reply to
HangaS
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If you search this newsgroup you will find lots of references for similiar issue.

The frist step to verify that you have the latest ADSL firmware loaded onto your router.

Reply to
Merv

I did a few searches before I post, but I guess I ruled out the firmware version issue cos the router is brand new with a recent manufacture date.

I don't have it in front of me 'till monday, nor I remember the IOS version atm. I just now it has Advanced IP services option.

I was pretty convinced it was some ATM configuration issue I was missing, but I'll check the ADSL firmware issue as soon as I can.

Thanks

Reply to
HangaS

Post the output of show version as that info will be helpful for responders

Also output of show dsl int atm 0

Reply to
Merv

Hi,

I only now got the oportunity to get back to this and check the version of the ADSL firmware.

Looks like I'm running a pretty old version, despite the router is brand new and manufactured in 11-Jan-08.

I'll try with 3.0.10 as it is the latest available on ftp://ftp.cisco.com/pu= b/access/800 to see how it goes.

Thanks

c877#show version Cisco IOS Software, C870 Software (C870-ADVIPSERVICESK9-M), Version

12.4(6)T9, RELEASE SOFTWARE (fc2) Technical Support:
formatting link
(c) 1986-2007 by Cisco Systems, Inc. Compiled Tue 09-Oct-07 18:56 by khuie

ROM: System Bootstrap, Version 12.3(8r)YI4, RELEASE SOFTWARE

c877#show dsl int atm 0 ATM0 Alcatel 20190 chipset information ATU-R (DS) ATU-C (US) Modem Status: Showtime (DMTDSL_SHOWTIME) DSL Mode: ITU G.992.5 (ADSL2+) Annex A ITU STD NUM: 0x03 0x2 Chip Vendor ID: 'STMI' 'BDCM' Chip Vendor Specific: 0x0000 0x918F Chip Vendor Country: 0x0F 0xB5 Modem Vendor ID: 'CSCO' ' ' Modem Vendor Specific: 0x0000 0x0000 Modem Vendor Country: 0xB5 0x00 Serial Number Near: FHK1202252L Serial Number Far: Modem Version Near: 12.4(6)T9 Modem Version Far: Capacity Used: 49% 100% Noise Margin: 19.0 dB 10.5 dB Output Power: 19.5 dBm 12.0 dBm Attenuation: 54.0 dB 20.0 dB Defect Status: None None Last Fail Code: None Watchdog Counter: 0x88 Watchdog Resets: 0 Selftest Result: 0x00 Subfunction: 0x00 Interrupts: 22976 (0 spurious) PHY Access Err: 0 Activations: 1 LED Status: ON LED On Time: 100 LED Off Time: 100 Init FW: embedded Operation FW: embedded FW Version: 2.5.42

DS Channel1 DS Channel0 US Channel1 US Channel0 Speed (kbps): 0 3061

0 747 Cells: 0 0 0 114975 Reed-Solomon EC: 0 0 0 0 CRC Errors: 0 0 0 0 Header Errors: 0 0 0 0 Total BER: 0E-0 0E-0 Leakage Avarage BER: 0E-0 0E-0 Interleave Delay: 0 4 0 4

LOM Monitoring : Disabled

DMT Bits Per Bin

000: 0 0 0 0 0 0 0 6 9 A A B B C C C 010: C C C C C C C C B B B B A A A A 020: 0 2 2 4 5 5 5 6 6 6 5 5 5 5 6 5 030: 5 5 5 7 7 8 8 8 8 8 8 8 8 8 2 7 040: 7 7 7 7 7 7 7 7 7 7 7 7 7 7 7 7 050: 7 7 7 7 7 7 7 7 7 7 7 7 7 7 7 7 060: 6 6 6 6 6 6 6 6 6 6 6 6 6 6 6 6 070: 6 6 6 6 6 6 6 6 6 6 6 6 5 5 5 6 080: 5 5 5 5 5 5 5 5 5 5 5 5 5 5 5 5 090: 5 5 2 4 5 5 5 5 5 5 5 5 5 5 5 5 0A0: 5 5 5 5 5 5 5 5 5 5 5 4 5 5 5 5 0B0: 4 4 4 4 4 4 4 4 4 4 4 5 5 4 4 4 0C0: 4 4 4 4 4 4 4 4 4 4 4 4 4 4 2 4 0D0: 4 4 2 2 4 4 4 4 4 4 4 4 4 4 2 2 0E0: 2 2 0 0 0 2 2 2 2 2 2 2 2 2 2 2 0F0: 2 2 2 2 2 2 4 2 2 2 4 4 2 4 2 4 100: 2 4 2 2 2 2 2 2 2 2 2 2 2 2 2 2 110: 2 2 2 2 2 2 2 2 2 2 2 2 2 2 0 2 120: 2 2 0 2 2 2 0 0 0 0 0 0 0 0 0 0 130: 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 140: 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 150: 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 160: 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 170: 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 180: 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 190: 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 1A0: 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 1B0: 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 1C0: 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 1D0: 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 1E0: 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 1F0: 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0

DSL: Training log buffer capability is not enabled

Reply to
HangaS

onftp://ftp.cisco.com/pub/access/800

IOS version 12.4(6)T9 has been deferred by Cisco ( read junked)

Reply to
Merv

Problem solved, thanks! Maybe I'll upgrade the IOS later. I just don't understand how a device assambled in Jan 08 was fitted with a rather old software image.

Just so it may help other users that come across the same issue as me this is what happened.

I was replacing the modem supplied with the Vodafone PT ADSL2+ Service with a Cisco 877 but I was only getting about half the bandwith I could get with the supplied modem.

The solution was to upgrade the DSL firmware to version 3.0.10

You can get the firmware at ftp://ftp.cisco.com/pub/access/800

Thanks Merv by the tips!

Reply to
HangaS

Out of curiosity, what are you getting now in terms of bandwidth ?

Reply to
Merv

The max I could get was 7.6Mbps, (we have contracted 12Mbps) but the wire loopback test done by the install technitian rated only 7.6 due to distance (I was expecting this)

But altough the new firmware doubled the previous bandwith look's like its not 100% yet the DS field of show dsl int atm 0 reports 6135 only (90% capacity used)

Also the contracted uplink should be 768Kbps and I'm getting 747

I can download from the ISP mirrors @~620KB/s

As you can see in the show dsl command,I've upgraded the IOS, which comes with dsl 3.0.14 embeded expecting to get 100% but that didn't help. I can live with 90% for now. But I might come back to this latter.

c877#show dsl interface atm0 ATM0 Alcatel 20190 chipset information ATU-R (DS) ATU-C (US) Modem Status: Showtime (DMTDSL_SHOWTIME) DSL Mode: ITU G.992.5 (ADSL2+) Annex A ITU STD NUM: 0x03 0x2 Chip Vendor ID: 'STMI' 'BDCM' Chip Vendor Specific: 0x0000 0x918F Chip Vendor Country: 0x0F 0xB5 Modem Vendor ID: 'CSCO' ' ' Modem Vendor Specific: 0x0000 0x0000 Modem Vendor Country: 0xB5 0x00 Serial Number Near: FHK1202252L Serial Number Far: Modem VerChip ID: C196 (0) DFE BOM: DFE3.0 Annex A (1) Capacity Used: 90% 100% Noise Margin: 9.0 dB 14.5 dB Output Power: 19.0 dBm 12.0 dBm Attenuation: 42.0 dB 20.0 dB Defect Status: None None Last Fail Code: None Watchdog Counter: 0x33 Watchdog Resets: 0 Selftest Result: 0x00 Subfunction: 0x00 Interrupts: 8269 (0 spurious) PHY Access Err: 0 Activations: 1 LED Status: ON LED On Time: 100 LED Off Time: 100 Init FW: init_AMR-3.0.014_no_bist.bin Operation FW: AMR-3.0.014.bin FW Source: embedded FW Version: 3.0.14

DS Channel1 DS Channel0 US Channel1 US Channel0 Speed (kbps): 0 6135

0 747 Cells: 0 150828 0 10402034 Reed-Solomon EC: 0 916 0 0 CRC Errors: 0 26 0 0 Header Errors: 0 24 0 0 Total BER: 0E-0 4174E-10 Leakage Average BER: 0E-0 4182E-10 Interleave Delay: 0 0 0 0 ATU-R (DS) ATU-C (US) Bitswap: enabled enabled Bitswap success: 0 0 Bitswap failure: 0 0

LOM Monitoring : Disabled

DMT Bits Per Bin

000: 0 0 0 0 0 0 0 7 9 9 A B B B C C 010: C C C C C C C C C B B B B A A 9 020: 0 5 6 7 8 9 8 9 9 9 9 9 9 9 9 9 030: 9 9 9 B B B B C C C C C C C B B 040: B B B 2 B B B B B A B B A A A B 050: B B B B B B A A A A A A A A A A 060: A A A A A A A A A 9 9 9 A 9 9 A 070: A A 9 A A A A 9 A 9 9 9 9 9 9 9 080: 9 9 9 9 9 9 9 9 9 9 8 9 9 9 9 9 090: 9 8 5 8 8 8 8 8 8 8 8 8 8 8 9 8 0A0: 8 8 8 9 9 9 9 8 8 8 8 8 8 8 8 8 0B0: 8 8 8 8 8 8 8 7 7 8 8 8 8 8 8 8 0C0: 8 8 7 7 7 7 8 7 7 7 7 7 7 7 7 7 0D0: 7 7 7 7 7 7 7 7 7 7 7 7 7 7 7 6 0E0: 6 6 5 2 2 5 6 7 5 6 6 7 7 7 7 7 0F0: 6 6 6 7 7 6 7 7 7 7 7 7 7 7 7 7 100: 7 7 7 7 7 7 7 7 7 7 7 6 6 6 6 6 110: 6 6 6 6 6 6 6 5 5 5 5 5 5 5 5 5 120: 5 5 4 4 4 4 4 3 4 4 4 4 4 4 4 3 130: 2 3 2 2 3 2 2 2 2 2 2 2 2 2 2 2 140: 2 2 2 2 2 2 0 2 2 2 2 0 0 0 0 0 150: 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 160: 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 170: 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 180: 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 190: 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 1A0: 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 1B0: 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 1C0: 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 1D0: 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 1E0: 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 1F0: 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0

DSL: Training log buffer capability is not enabled

Reply to
HangaS

quoted text -

Thanks for posting this - very interesting.

I had found the more recent firmware benificial in terms of whether the link worked or not but I have not observed throughput benefits.

Reply to
Bod43

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