The ramblings of a computer geek
The first part is a basic deployment of BGP between two routers (Router A and Router B) with a single point to point link. In this example, each router is within its own AS (Autonomous System). Therefore any routes exchanged between each AS are eBGP (external BGP) routes. Routes exchanged within an AS are known … Read more
An unexpected change in behaviour was observed in terms of the interlink ports 57,65. The default beheaviour of the ports on previous software version: 22.6.1.4 was that being they are QSFP (40Gbit) ports that they operated at 40Gbit being that the QSFP DAC cable was 40Gbit, i.e. there was no specific port configuration for the … Read more
We had a bit of an oddity on an Extreme Networks SwitchEngine (XOS) switch running: 32.7.1.9patch1-26, devices connecting to a specific VLAN that should be authenticated by Netlogin (NAC) via radius were failing giving the error below. Checking the switch, the VLAN very much existed, so it was a mystery why it said it wasn’t. … Read more
If you have a VLAN which used as the source of multicast streams there are considerations on how it is used specifically when you are “stretching” that VLAN across the fabric, i.e. you have the VLAN and router(s) for that VLAN on a particular distribution switch pair, but then you have the VLAN stretched across … Read more
Multicast is a networking method used to efficiently transmit data to multiple recipients simultaneously. Unlike unicast (one-to-one) and broadcast (one-to-all) communication, multicast is a one-to-many or many-to-many method where data is sent only to devices that are interested in receiving it, rather than to all devices on a network. In multicast, devices that want to … Read more
Multicast is a networking method used to efficiently transmit data to multiple recipients simultaneously. Unlike unicast (one-to-one) and broadcast (one-to-all) communication, multicast is a one-to-many or many-to-many method where data is sent only to devices that are interested in receiving it, rather than to all devices on a network. In multicast, devices that want to … Read more
I always find this a bit of a confusing one, just running a “no lacp key” doesn’t work, what you actually need to do is set it to “default”. So for example let’s say you have a LACP key assigned to interface 1/13 which you want to remove, its as simple as running the following … Read more
I was attempting to run a Python script on a Extreme Networks EXOS switch, but it didn’t work. The fix was simple, add the following line to the Python script to import the “exsh” module.
On VOSS/FabricEngine SLPP should be configured on every VLAN at the point where it leaves the fabric and meets a non-fabric loop prevention strategy. This will prevent any loops from impacting the fabric by closing down ports where a loop is detected. The below assumes you already have SLPP configured on your upstream switches. If … Read more
At the time of writing (29/03/2024) the recommended EXOS (SwitchEngine) version for the X450-g2, X460-g2 and 5420 (as well as other hardware) is EXOS 31.7.2.28-patch1-75. We recently purchased some new 5420 switches and are upgrading some existing X450-g2 and X460-g2 to the latest recommended software versions. However we have identified an issue that currently at … Read more