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1
Cisco Routers and Switches / Re: Corporate LAN down due to Cisco bug
« Last post by Flintstone on Yesterday at 05:22:58 AM »
Yes, there was a mis-configuration when the switch stack was deployed over a year ago.  It just took that long for the bug to manifest itself.  So everything was working as normal and a year later 'kapow' the Network was down.  I've also noticed that Cisco haven't officially released the bug details to the public?

CheerZ
2
Cisco Routers and Switches / Re: Corporate LAN down due to Cisco bug
« Last post by Michael McNamara on May 17, 2019, 11:32:51 AM »
That's an interesting bug... if I read correctly though there was an initial mis-configuration that lead to the bug, correct?

Cheers!
3
Cisco Routers and Switches / Corporate LAN down due to Cisco bug
« Last post by Flintstone on May 17, 2019, 06:09:33 AM »
Hi Guys,

Last week at 07:00 we lost our Corporate LAN at our HQ.  On arrival to work the car park barrier was up, which is never a good sign at 08:00 in the morning.  On entering our Office we were inundated with faults and couldn't connect to the Network.  We went to our 'Comms Room' and our Cisco VSS core switches were running at 99% CPU utilisation. We suspected a loop somewhere so started to disconnect links into the core until the CPU recovered.  Once we had a stable LAN we reconnected the links one by one until we hit the issue again.  All links were reconnected except to one of our outbuildings on the Campus.  Corporate LAN
recovered at 08:45.  At the outbuilding we could see that the core switches and edge switches were still running at 99% CPU.  We removed the links to the core switches until we identified a single edge switch.  The outbuilding had an edge Cisco 3850 stack of two switches with two port channels connecting into the core switches of that outbuilding.  We rebooted the edge Cisco 3850 stack and disconnected the links into the core of that outbuilding.  We now had a stable LAN at the outbuilding.  On further investigation we discovered we had hit a bug on our Cisco 3850 switches:

bug CSCul30426 (https://quickview.cloudapps.cisco.com/quickview/bug/CSCul30426)

Conditions:
This defect is seen when trying to build a port-channel between a 3850 and any other switch with the following conditions:

1. The native vlan is in the suspended state
or
2. The native vlan is not present in the vlan database.

Workaround:
Once you created the layer two vlan or change it to an "active" state, the port-channel will form as expected.


In our case the native Vlan was not present in the Vlan database on the edge switch and instead of having a single logical (port-channel); with two associated bundled links, we had two separate links connecting into the core switch of that outbuilding creating a loop and associated broadcast storm which then affected the corporate VSS core switches; causing CPU of 99%, and associated Network instability.  To resolve the issue we initially only used single links in the port-channel and later created the native Vlan into the Vlan database and reconnected the second link of the port-channel.

CheerZ :)
4
General Discussion / IFC# to Slots and ports
« Last post by rloughlin on May 16, 2019, 12:50:12 PM »
Hey folks

I have a question we have a device on a proof of concept here and its giving me stats on IFC#'s (ifc151) but its bot giving me the ports that corrilate to that IFC number.  How do i find out what that is.

Any info would be great

Thanks

Modify message
5
Scripting / IFC# to Slots and ports
« Last post by rloughlin on May 15, 2019, 04:36:18 PM »
Hey folks

I have a question we have a device on a proof of concept here and its giving me stats on IFC#'s (ifc151) but its bot giving me the ports that corrilate to that IFC number.  How do i find out what that is.

Any info would be great

Thanks

6
Help Wanted / Avaya update
« Last post by amlk on May 12, 2019, 02:17:47 PM »
Hi!
How get firmware for ERS 3500?
I don't have "Sold Number" and so on....
Thanks in advance!
PS.
Or may be I dont need any update?
3524GT: HW:01   FW:1.0.0.4   SW:v5.0.0.008
7
General Discussion / Avaya SIP 1140e registered to Audiocodes M3000
« Last post by Steve D on May 06, 2019, 02:09:19 PM »
Here goes. I have a need to to implement a number of 1140e sets from UNISTIM to SIP. I have done one set and the conversion was successful with the help of some of the instructions on the here So here is my problem; I want these phones to register to my Audiocodes Mediant 3000 SBC as Far End Users. I already have quite a few, 20-30 Polycom IP-7000 sets and a couple of Audio Codes 440HD registered and they work properly. In your sample files I don't see where you specify the sets Directory number or how to configure the set for TLS and SRTP. You also make reference to a "dialplan.txt file but no examples. I do have these in the Polycom but I doubt that they would be the same. When the set comes up now it asks for the ID and password I have put the set DN in as the ID (44737), but am not sure about the password. I have entered 44737 here but the set goes to another screen and finally just says "logging in user" and just stays there. Looking at the Sys Logs in the M3000 I see the set trying to register but always fails. So at this point I'm not sure where the problem lies or even if the M3000 will support the 1140e. The LW version on the 1140e is 04.04.29.00.
8
Hi,

Does anyone have any solution to blocking traffic generated by mikrotik neighbour.
wiki.mikrotik.com/wiki/Manual:IP/Neighbor_discovery
Packet is:  UDP src. address X.X.X.X src port. 5678 => dst. address 255.255.255.255 dst port. port 5678

I wrote the following ACL but it does not work. What am I doing wrong?

Tested on ERS 5530-24TFD FW:6.0.0.21  SW:v6.3.6.017 and ERS 5520 with same FW and SW.

qos traffic-profile classifier name mtik ethertype 0x806 eval-order 1 drop-out-action disable
qos traffic-profile classifier name mtik addr-type ipv4 protocol 17 dst-port-min 5678 dst-port-max 5678 drop-action enable eval-order 2 drop-out-action enable
qos traffic-profile classifier name mtik addr-type ipv4 protocol 17 src-port-min 5678 src-port-max 5678 drop-action enable eval-order 3 drop-out-action enable
qos traffic-profile classifier name mtik eval-order 4 drop-out-action disable
qos traffic-profile set port 1 name mtik

9
Hi,

Any rule with "qos ip-acl" after few seconds block all traffic on a given interface - it should pass
all traffic but it blocks all traffic - What is wrong?

sample rule:
qos ip-acl name bmtik drop-action disable
qos acl-assign port 1 acl-type ip name bmtik

Could someone check this simple rule on his device?

Tested on ERS 5530-24TFD FW:6.0.0.21  SW:v6.3.6.017 and ERS 5520 with same FW and SW.


10
General Discussion / Re: Cisco vs Avaya
« Last post by TankII on May 03, 2019, 06:52:47 PM »
I also heard Extreme is looking at shrinking the ERS platform - Except it is selling almost as fast as they can make them.
Regarding Cisco's Campus Lan - It is an overlay, wholly dependent upon a Layer-3 protocol underneath, with all the associated foibles of BGP, OSPF, etc.  If you want to stretch the fabric through your Data Center, you can only bridge the two fabrics via Nexus 7000 Chassis.  Also, if you want to extend this to the edge, only the 3850's are capable of doing this.
SPB-M, what Extreme bought with the Avaya purchase, doesn't have these limitations, at least so far through our implementation.  While we could have implemented this on our ERS8800 platform, we made the move after the VSP 8200 platform was released.
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