The ramblings of a computer geek
In the previous article we got our AS Blue 65001 operating as we want it, now we crank up the complexity with a more complex example which is more like you’d find or want to architect in real world scenario. Previously our AS Blue 65001 only had a single exit point to AS Green 65002, … Read more
In the previous article we discovered that iBGP requires a topology and usage that ensures that our exchange of routes between routers is not stopped by the iBGP rule: “A route learned via iBGP must not be advertised to another iBGP peer.” We came across this problem in the previous article where although in normal operational the routes were being … Read more
We’ll continue to explore Internal BGP (iBGP) in this next part of our deployment. We are going to be deploying another route in the AS Blue 65001. Remember that eBGP is used between AS and iBGP is used within an AS. Be aware however, that this lab topology is flawed in terms of its configuration, but it shows up … Read more
Internal BGP (iBGP) is the next part of our deployment. We are going to be deploying two routers within one of the AS, Blue 65001. Remember that eBGP is used between AS and iBGP is used within an AS. So in this case our second router, Router B, will be linked to Router A via a single link, these … Read more
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