µpdate

µpdate: little bit of OSPF

2017/11/09 network, µpdate

ewald@george# show interfaces | commands | grep ‘description\|cost’ | grep vti
set vti vti0 description ‘olivia.abcdef.be’
set vti vti0 ip ospf cost ’15’
set vti vti1 description ‘alivia.abcdef.be’
set vti vti1 ip ospf cost ’20’
ewald@lucas# show interfaces | commands | grep ‘description\|cost’ | grep vti
set vti vti0 description ‘alivia.abcdef.be’
set vti vti0 ip ospf cost ’15’
set vti vti1 description ‘olivia.abcdef.be’
set vti vti1 ip ospf cost ’20’
ewald@alivia# show interfaces | commands | grep ‘description\|cost’ | grep vti
set vti vti0 description ‘lucas.abcdef.be’
set vti vti0 ip ospf cost ’20’
set vti vti1 description ‘george.abcdef.be’
set vti vti1 ip ospf cost ’15’
ewald@olivia# show interfaces | commands | grep ‘description\|cost’ | grep vti
set vti vti0 description ‘george.abcdef.be’
set vti vti0 ip ospf cost ’15’
set vti vti1 description ‘lucas.abcdef.be’
set vti vti1 ip ospf cost ’20’

vti0 should be thought off as the horizontal lines, vti1 is the cross in the middle, left and right are location one (olivia and alivia) and two (george lucas). If a two third routers were to be connected to both routers on the same location respectively; they would receive equal metrics from announcements over both horizontal lines. in case of failure the remaining horizontal link would assume all traffic, once that fails the cross is ECMPed. set vti0 on lucas-alivia to 30 and the upper horizontal link becomes prefered path, in case the upper link fails it would ECMP over both vti1 links and finally use the backup link between lucas and alivia.

Ubiquiti Edgerouter X SFP and Edgepoint R6 compability report: SFP Ethernet

2017/03/26 ubiquiti, µpdate

I just ran tested and confirmed proper working of the Juniper SP7041-M1-JN on the Ubiquiti Edgerouter X SFP and Edgepoint R6 both running 1.9.1

Juniper SP7041-M1-JN allows you to transform a SFP slot into an Ethernet port

Source: http://articulo.mercadolibre.cl/MLC-434507651-sfp-transceiver-cisco-juniper-networks-740-013111-sp7041-m1-_JM

µpdate: single-disk benchmarking with fio

2015/05/01 storage, µpdate

Today I did ran a few benchmarks to get a grasp of single-disk performance and to make sure the underlying storage sub-system is not acting as a bottleneck. Earlier I discovered a device incompatibility between the onboard (Asrock H77 Pro4-M) Intel SATA-3 ports and Intel X25-E disks which lead to COMRESET failed (errno=-16) messages during Linux boot. The fix was a simple cable swap with SATA-2 compatible ports 3-6.
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µpdate: OSPF multipath routing on equal metrics

2014/07/04 edgeos, pfsense, µpdate ,

So, I was wondering why I frequently got disconnected from IRC and it turns out OSPF starts acting like multipath routing when you feed it two equal cost paths. To show and prove what’s happening.

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µpdate: asymmetric routing with VRRP and OSPF

2014/07/02 edgeos, vyatta, µpdate , ,

I was playing with my network today when I noticed an interesting side-effect of my current network architecture. Simply put there are two layers of routers; the first do intranet routing, the second layer takes care of everything else (ie. the internets). The image depicts my beautifully inspiring wallpaper on Windows 7 where we call for louise. I printed the the default gateway and it looks like we’re taking 1.65 towards shirley first. 1.65 is actually a VRRP address and 1.67 does the actual lifting as confirmed in the tracert below. From there we egress out of 0.33 and meet up with louise, ‘sup. louise stubborn as she is decides to take 0.34 home, jeff answers the call of duty, but couldn’t care less about the whole ordeal and sends them over 0.66 towards me.

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