The Journey of a Network Engineer:

November, 2011

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November 29, 2011  1:29 AM

How Rendezvous Points (RP) Chosen in Auto-RP Multicast Domain?



Posted by: Sulaiman Syed
auto-rp, CCIE, Cisco, dense, how, MA, multicast, Rendezvous Point, RP, sparse

IP Multicast can work on Dense, or Sparse Mode. Dense, where all multicast traffic is flooded out of all the interfaces other than the one it came from (split horizon). It is easy to configure, and there are no planning with it. The down side is, it might create congestion in the network. Specially...

November 26, 2011  5:16 AM

How to upgrade Citrix NetScaler Firmware?



Posted by: Sulaiman Syed
Citrix, firmware, NetScaler, tar, upgrade, winscp

We are in the middle of installing new Citrix NetScaler for load balancing purposes. We ran into some issues with the box. It was decided that we need to update the firmware. It is simple and straight forward. First, download the...


November 23, 2011  10:02 AM

How to configure route dampening in BGP



Posted by: Sulaiman Syed
CCIE, dampening, flap, half-life, how, map, route, router, to

Flapping routes are bad news in BGP. flapping routes are the routes that go up and down in very short time. they are bad news cause they require changes in routing table. routing table that consists of 100 thousand routes cause high load on router. a flapping route will: 1- change the table by...


November 20, 2011  3:11 AM

How to configure Path Variables for BGP aggregation route?



Posted by: Sulaiman Syed
Aggregation, Attribute, CCIE, Cisco, how, Path, route-map, router, to, variables

Using route aggregation (summary) is one of the important tools with BGP. it provides a strong foundation to keep the routes from flapping, or making rapid changes within the BGP backbone cloud. but what if we want to advertise the aggregation with different AS Path variables? as it is known BGP...


November 15, 2011  3:15 AM

How to configure BFD?



Posted by: Sulaiman Syed
bfd, CCIE, Cisco, detection, failure, link, router, routing, switch

Bi-directional Forwarding Detection (BFD) is the technology responsible to detect the link down in the milliseconds region. It is important to be used specially in Datacenter, where any link failure should be detected very fast so the network can converge. This of course requires a proper...


November 10, 2011  7:35 PM

How to add reliable default route with RIP?



Posted by: Sulaiman Syed
CCIE, Cisco, how, monitor, reliable, RIP, route, router, static, to, track

Adding reliable default route with RIP The command for distributing a default route into RIP process is very straight forward.  Lets go with the syntax straight away.

router rip default-information originate route-map RELIABLE ! route-map...


November 7, 2011  4:35 AM

How to filter routes in RIP?



Posted by: Sulaiman Syed
CCIE, Cisco, distribute-list, how, loop, prefix-list, RIP, route, router, to

Filtering routes in RIP Although rip is not the best routing protocols, the mechanism of filtering routes can be applied to other routing protocols a well. My personal advice will be to stay away as much as possible from RIP. RIP is a routing loop magnet, you never know when you...


November 3, 2011  9:06 AM

How to configure Frame-Relay Switching?



Posted by: Sulaiman Syed
CCIE, Cisco, Configure, exam, how, Lab, map, router, switching

For some reason i thought that i have written an entry for Frame-Relay switching. But the records show none. So here it comes. During studies of CCIE, you might need to configure a Router to act as a frame-relay switch. The configurations are very simple and straight forward. There is the old...


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