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Contributor
Posts: 13
Registered: ‎11-11-2009
0

WXC Flapping Issue

I have an issue with my WXC's. I have a very simple set-up as per below:

 

DataCentre---WXC---SSG----- Internet ------SSG---WXC---Local Subnet

 

Whenever I enable RDP (MS Terminal Services) compression on the WXC's they work for a while, and at a random point in the future (can be minues, hours, or even days) the RDP sessions going across the WXC's start flapping.

Additionally sometimes HTTP stops working too.

As soon as I remove the affected protocol from compression on both ends of teh WXC's and re-enable the compression immediately, it starts working again.

My issue is that this is not stable enough, with this behaviour, to implement in a live environment.

Has anyone out tehre had similar issure and solved them?

Thanks.

 

PS: I admit to not being a Juniper expert, but I have plenty of networking experience with oter equipment.



Andrew Peart
mbits - Senior Network Engineer
Recognized Expert
Posts: 319
Registered: ‎11-02-2007
0

Re: WXC Flapping Issue

Hello,

 

Can I just ascertain if you have other protocols running through this network and these are optimized OK?  Do they suffer ever?

 

Have you by any chance added RDP into NSC (caching)?

Danny Jump
Technical Marketing Manager - Access and Acceleration Business Unit
Contributor
Posts: 13
Registered: ‎11-11-2009
0

Re: WXC Flapping Issue

Thanks for the reply DJ

and no I have not added RDP into NSC caching.

In fact I reset both boxes back to factory defaults and implemented the 2 as a hub and spoke implementation.

I have all the default protocols turned on under compression->application filter that are on by default.

I am turning HTTP acceleration back on today to see whether we get issues with it again. I am hoping I have just missed something basic, as I have never worked with WXC's before and was just setting them up using the tutorials on the Juniper website.

I am more than happy to send you the configs if that would help. There is nothing proprietory in our configs.

Thanks for your fast reply btw.

 

Andrew Peart

mbits - Senior Network Engineer

 



Andrew Peart
mbits - Senior Network Engineer
Recognized Expert
Posts: 319
Registered: ‎11-02-2007
0

Re: WXC Flapping Issue

Andrew,

 

Please start by ENSURING 100% that all the local and remote interfaces on the WXC and the devices they connect too have there speed and duplex set correctly. Also go and check for CRC and collisions because even setting speed 100Mbps and F/Duplex on say a wxc device and a Cisco switch I have experienced issues and we have had to run this auto/auto and all suddenly it would work....

 

 

So PC - SWITCH - WXC - Router/Firewall on each side of the network you need to check four interfaces and be 100% they are correct.

 

 

 

Danny Jump
Technical Marketing Manager - Access and Acceleration Business Unit
Contributor
Posts: 13
Registered: ‎11-11-2009
0

Re: WXC Flapping Issue

 


Andrew Peart
mbits - Senior Network Engineer
Recognized Expert
Posts: 319
Registered: ‎11-02-2007
0

Re: WXC Flapping Issue

Andy,

 

Did you mean to type something in your post as it came through empty Smiley Happy

 

Danny Jump
Technical Marketing Manager - Access and Acceleration Business Unit
Contributor
Posts: 13
Registered: ‎11-11-2009
0

Re: WXC Flapping Issue

Thanks,

I have checked each point along the path and ensured that all the interfaces are set to auto negotiate both speed and duplex. I have then checked each individual interface to ensure that it had negotiated to 1000/full and they have.

Also I have run the interface test facility on the WXC's across both the local and remote interfaces to ensure that they are working properly. Then I ran the command "show -run interface -verbose" on each WXC to ensure that the negotiated speeds were correct.

I have included mud maps for you below so you can see what I mean.

 

Our Office

PC's----------SW g1/24----------(local) WXC2600 (remote)----------e0/9 SSG140 bdsl(2Mbit)---------- WAN

                                Auto             Auto                               Auto               Auto

                               1000/Full    1000/Full                      1000/Full      1000/Full

  

 

Data Centre

WAN----------(2Mbit)bdsl SSG550 e0/0----------(remote) WXC3400 (local)----------g1/2 SW

                                                            Auto             Auto                               Auto               Auto

                                                           1000/Full    1000/Full                      1000/Full       1000/Full

 

Hope this helps.



Andrew Peart
mbits - Senior Network Engineer
Recognized Expert
Posts: 319
Registered: ‎11-02-2007
0

Re: WXC Flapping Issue

Andy,

 

Did you manage to look at the switch/SSG and ensure that you have zero collision or CRC errors on the interfaces?

 

Also, do you have an spurious error in the system log on the WXC's?

Danny Jump
Technical Marketing Manager - Access and Acceleration Business Unit
Contributor
Posts: 13
Registered: ‎11-11-2009
0

Re: WXC Flapping Issue

DJ,

Yes I have checked all the counters on each interface and they are all at 0 collisions, and 0 CRC errors.

I have attached a copy of the log file from when one of the WXC's hung badly on us, maybe it will mean more to you than me. I do have a Juniper TAC case iopen for it, but have not receiveed much support so far.

But I can't see any SPURIOUS error messages i nthe logs.

 



Andrew Peart
mbits - Senior Network Engineer
Contributor
Posts: 13
Registered: ‎11-11-2009
0

Re: WXC Flapping Issue

As an addendum HTTP just stopped working.

As soon as I disabled WXC compression on HTTP, I could access the WEB again.

Below is the logs at the time it happened:

 

2009-11-13 14:00:50 7DC0E154 I03 Finished hourly rollup.
2009-11-13 14:04:51 7DC06A58 I03 Saved monitoring stats to flash
2009-11-13 14:09:43 DB4297DC I14 LAN-Intf - PPS- PktRx= 55.0/875.0 (FRI NOV 13 14:06:41 2009)  PktTx= 8.0/510.0 (FRI NOV 13 14:06:41 2009)  - #samples=3300
2009-11-13 14:09:43 DB4297DC I14 WAN-Intf - PPS- PktRx= 9.0/357.0 (FRI NOV 13 13:52:29 2009)  PktTx= 56.0/548.0 (FRI NOV 13 14:06:41 2009)  - #samples=3300
2009-11-13 14:33:53 6E385CC0 I11 SA: SYNC - socket RESET received. unit=0 ses=1 sock=29 ccip=172.16.10.251 mtid=0
2009-11-13 14:33:53 6E385CC0 I11 SA: reset sync socket. unit=0 ses=1 ccip=172.16.10.251 sock=29
2009-11-13 14:33:53 6CCAE28C I11 [wx-event@juniper.net eventtime="1258083233" metric="Decompressor Session Closed" sev="warn" type="sys"] SA: Session closed - ip=172.16.10.251 unit=0 sesid=1 mtid=0
2009-11-13 14:33:53 6CCAE28C I17 SNMP enterprise trap: 'Decompressor Session Closed' not sent: SNMP/traps disabled (or) no trap destination
2009-11-13 14:33:53 6CCAE28C I26 RDTPSmiley Very HappyST: tunnel remove. unitid=0 sesid=1
2009-11-13 14:33:53 6CCAE28C I11 SA: FEC session closed. ccip=172.16.10.251 ses=1 unit=0 mtid=0
2009-11-13 14:33:56 6CE95AE8 I11 SA: pnHandleDCNegInit: Initial negotiation received. SR IP=172.16.10.251 mtid=0 flags=8050
2009-11-13 14:33:56 6CE95AE8 I11 SA: pnHandleDCNegInit: Initial negotiation accepted. SR IP=172.16.10.251 unit=0
2009-11-13 14:33:56 6CE95AE8 I11 ctrlSetSwVersion: Secondary IP=0xfb0a10ac will use same sw version=9 as primary use
2009-11-13 14:33:56 6CC655B4 I11 SA: pndcSessionOpenPhase2: negotiation - Phase 2 request received. SR IP=172.16.10.251 sync=29
2009-11-13 14:33:56 6CC655B4 O11 [wx-event@juniper.net eventtime="1258083236" metric="Decompressor Session Opened" sev="ok" type="sys"] SA: Session opened - ip=172.16.10.251 unit=0 sesid=1 mtid=0 flags=81d0.
2009-11-13 14:33:56 6CC655B4 I17 SNMP enterprise trap: 'Decompressor Session Opened' not sent: SNMP/traps disabled (or) no trap destination
2009-11-13 14:33:56 6CC655B4 I26 RDTPSmiley Very HappyST: DC session started. unitid=0 sesid=1 status=0
2009-11-13 14:33:56 6CC655B4 I11 SA: Session opened. ccip=172.16.10.251 ses=1 unit=0 mtid=0 swver=9
2009-11-13 14:33:56 6CC655B4 I35 pnAAPhandleDstInit: unit=0 ses=1
2009-11-13 14:33:58 6E385CC0 I13 Initial negotiation succeeded. DC will start receiving block-encoded data from 172.16.10.251



Andrew Peart
mbits - Senior Network Engineer
Recognized Expert
Posts: 319
Registered: ‎11-02-2007
0

Re: WXC Flapping Issue

Andy,

 

Two things. One I see constants tunnel restarts in the log. What is the WAN environment connecting these two boxes together? Also, I see you are using 5.7.1.1, please upgrade to 5.7.2......as a foot note 5.7.3 will be released end of this week, its just a scheduled maintenance release, not specific to anything I see in your log but always good to have most recent bug fixes.

 

I'm more concerned with the fact I see lots of box restart and tunnel bounces.

 

What is your jtac case number please?

Danny Jump
Technical Marketing Manager - Access and Acceleration Business Unit
Contributor
Posts: 13
Registered: ‎11-11-2009
0

Re: WXC Flapping Issue

JTAC Case# 2009-1025-0104

JTAC Case Desc: When using the WXC to accelerate RDP Traffic the RDP sessions start flapping

 

We have 2 WAN links.

The primary link is a 2Mbit BDSL Service. Basically it is a dedicated 2Mbit connection for all our Primary Traffic (which is the RDP traffic).

The 2nd link is a ADSL2 link that normally negotiates to 20.221Mbps/915Kbps

 

No other equipment has problems with these links and if I disable the RDP traffic from being compressed then there are no issues with it flapping. As you would expect I have similar ssues with Telnet sessions dropping out if I use the WXC to compress them.

 

Is there an issue with the Hardware/Software on there boxes?

Both boxes are already upgraded to 5.7.2 as far as I can tell. I have pasted a copy of the "Help->About" box below for each WXC for your confirmation.

 

Office WXC:

IP address: 172.16.10.253

Device name: WXC-172.16.10.253

Software version: 5.7.2.0

Model No.: WXC-2600 - v1.0

Local Interface Media: Copper

Remote Interface Media: Copper

Serial number: 2600000734

License key: B6R6-X56C-P3V2-HUQD-996C-9999

Additional modules licensed: Packet Flow Acceleration

 

DataCentre WXC:

IP address: 10.3.3.2

Device name: WXC-10.3.3.2

Software version: 5.7.2.0

Model No.: WXC-3400 - v1.0

Local Interface Media: Copper

Remote Interface Media: Copper

Serial number: 3400000592

License key: Y4R4-BBZW-DYRH-B556-99NQ-9999

Additional modules licensed: Packet Flow Acceleration

 



Andrew Peart
mbits - Senior Network Engineer
Recognized Expert
Posts: 319
Registered: ‎11-02-2007
0

Re: WXC Flapping Issue

Andy,

 

It is possible there is a h/w problem but its a long shot.

 

Please send me a copy of the configs, I suspect there is something silly somewhere.

 

P.S. What is the jtac case you have?

 

P.P.S. Have you spoken to anybody from JNPR Oz, maybe Steve Smith?

Danny Jump
Technical Marketing Manager - Access and Acceleration Business Unit
Juniper Employee
Posts: 33
Registered: ‎03-18-2009
0

Re: WXC Flapping Issue

I would like to clarify one point - Does it break :

 

a. only when you have AFP enabled (TCP Acceleration)

 

or

 

b. just by turning ON compression for those applications?

 

In case it's a., then we can start with simply disabling AFP and leave compression ON and see how it goes. This should already give us some clues on where to look at.

 

Let us know,

--E

 

 

Highlighted
Contributor
Posts: 24
Registered: ‎09-22-2009
0

Re: WXC Flapping Issue

Hi,

I am imaging why no one asked below questions? If you go throught past post you can find this problem.

 

Is encyrption or compression enabled on RDP?

Compression and Acceleration enabled on RDP?

 

I would suggest to remove it from Acceleration as i had faced similar problems.

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