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StalinBabu.com – My Personal Blog
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Technology

Unicast Reverse Path Forwarding (uRPF)

What is unicast reverse path forwarding: 1. Used to prevent malicious traffic on a network 2. This functionality works by verifying the source IP address in the packets that are being forwarded by the router 3. If the source IP...

Technology

Using prefix-list example scenarios

Prefix lists are used to filter routes based on prefix and subnet masks. The following are some prefix-list examples. Prefix list can be applied directly on a neighbor statement for BGP or using a route-map ! Match only...

Technology

Route Maps

It is a serious of match and set statements similar if-then statements in a programming language. Facts about route maps Used to set special BGP attributes to certain routes (local preference, weight, metric etc) Used for Policy...

Technology

Facts or key information about MPLS:

In a MPLS network, the forwarding decision is made based on labels.MPLS labels are inserted between layer 2 and layer 3 The “P” router is the router inside the service provider network in the MPLS path LDP router ID is the...

Technology

OSPF Cheat Sheet

OSPF stands for Open Shortest Path First and it is a Interior Gateway Routing Protocol (IGP). RFC 2328 defines the standard for OSPF Version 2. The following are few facts about OSPF – Interior Gateway Routing Protocol...

Technology

Gateway load balancing protocol (GLBP)

This is cisco proprietary and communicates via UPD multicast 224.0.0.102 at port 3222. It provides load balancing between routers in a group. It uses one virtual IP address but multiple MAC address. The active virtual agteway...

Technology

Virtual Router Redundancy Protocol (VRRP)

This is a open standard protocol and documented in RFC 3768. It communicates using its own multicast transport via IP protocol 112 to 224.0.0.18. It used master and backup routers. The master router forwards the virtual mac...