The Journey of a Network Engineer:

router


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...


October 25, 2011  1:34 AM

How to Configure PPPoE?



Posted by: Sulaiman Syed
Cisco, Configure, dhcp, how, interface, ios, PPPoE, router, virtual

This is one of the interesting things i have learned in past week. PPP over Ethernet (PPPoE). It is simple, yet tricky. It also has a limitation that network engineers might not know which will bring their network down. Lets see a sample configuration of how to do it. First, configure one Router...


October 19, 2011  3:27 AM

How to configure Lock-and-Key (dynamic ACL)?



Posted by: Sulaiman Syed
?, ACL, Cisco, Configure, dynamic, how, Lock-and-key, network, router, to

Dynamic ACL are very interesting. They provide temporary access at certain times for certain users. Basically, the user will telnet to the router. If the authentication passes, then router permits that IP to to access the internal parts of the network. First, we need to create access-list,...


October 17, 2011  12:32 AM

Loopback address and MPLS-VPN!



Posted by: Sulaiman Syed
Configure, EIGRP, GNS3, how, ios, MPLS, RIP, router, switch, to, vpn

In this article, i will not go deeply into the issue of configuring MPLS-VPN. The steps were mentioned very clearly in an earlier post. MPLS-VPN Tutorial...


October 12, 2011  12:31 AM

How to Insure End to end connectivity in Frame-Relay



Posted by: Sulaiman Syed
active, CCIE, Cisco, Configure, end-to-end, how, ios, keepalive, network, PVC, router, to, VC

This is one of the nice features that i just discovered yesterday. It is the ability to make sure an end-to-end frame-relay connectivity between Cisco routers. In the local router, we can see the PVC status.
Rack1R3#show frame-relay pvc PVC Statistics for interface...


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