MPLS ATOM Interworking – Ethernet and IP Interworking is the capability of L2TPv3 to change encapsulations between CE devices. The transport on one CE device can be translated to another transport. An example of this would be Frame Relay to Ethernet over an MPLS cloud. Key points: Ethernet Interworking can be used with IP andContinue reading

Best Practice: Don’t use bandwidth statement

It’s considered a best practice to not configure the ‘bandwidth’ statement on physical router interfaces. This is because the routing protocol will throttle updates propagated through this interface. The one case where you’ll need to consider configuring the bandwidth statement is on Tunnel interfaces. This is because the default bandwidth of a Tunnel interface isContinue reading “Best Practice: Don’t use bandwidth statement”

A note on versions

Greg over at networkgremlins hand an interesting insight into the features in IOS versions. It’s primarily concerned with the SP lab, but will apply to any CCDE lab they set up as well… depending on the IOS version. Check it out here.

Installing VMWARE Server 1.0.5 on Ubuntu 8.04 – 64 bit editionapt-get install build-essentialapt-get install ia32-libsapt-get install xinetdapt-get install kernel-packagesudo touch /etc/vmware/ssl/rui.key sudo touch /etc/vmware/ssl/rui.crtdownload http://vmkernelnewbies.googlegroups.com/web/vmware-any-any-update-116.tgzunzip/untar & run runme.plsudo cp /lib/libgcc_s.so.1 /usr/lib/vmware/lib/libgcc_s.so.1/sudo cp /usr/lib/libpng12.so.0 /usr/lib/vmware/lib/libpng12.so.0/

Aggregation and Suboptimal Routing

This is a continuation from the last topic: route aggregation. When you advertise an aggregate, you effectively ‘hide’ topological information and can cause suboptimal routing. If you have 10.1.0.0/16 and 10.2.0.0/16 summarized into 10.0.0.0/8 and advertised via two links, one of the links may be the ‘best’ path for the traffic to take, but sinceContinue reading “Aggregation and Suboptimal Routing”

OpenDNS, DNS, and Anycast

I wanted to let everyone know about OpenDNS. They provide publicly-accessible DNS servers at the following addresses: 208.67.222.222 208.67.220.220 This is a fantastic service, and leads me to a discussion on the topic of Anycast and DNS. Anycast is one of the types of traffic flows. Remember the other types: Unicast: used for peer toContinue reading “OpenDNS, DNS, and Anycast”