Month: July 2015

Multicast Source Distribution Protocol (MSDP) in a BGP network

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In this article I am going to configure Multicast Source Distribution Protocol (MSDP) for a BGP network. It is not so different from configuring normal MSDP in your IGP and involves configuring an extra address-family in your BGP routing.

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Source Specific Multicast (SSM)

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In this article I will discuss IGMP v3 and Source Specific Multicast (SSM) with an example. As you remember from my previous post, I have enabled multicast on all routers and R01 is the RP. Here are some commands to have an initial configuration verification:

R01#sh ip multicast 
Multicast Routing: enabled
Multicast Multipath: disabled
Multicast Route limit: No limit
Multicast Triggered RPF check: enabled
Multicast Fallback group mode: Sparse
Multicast DVMRP Interoperability: disabled

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A video on OSPF NSSA and Totally NSSA Areas

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Here is a video on NSSA areas and their configuration.

Using BGP Communities

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A BGP community is a 32-bit number that can be attached to a prefix and sent to other ASs. It is transitive (any BGP router will pass it, whether or not it understands what to do with it) and optional (it does not need to be set).
In this article I want to talk about four community value that are mostly used.

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Network Time Protocol (NTP) on Cisco Routers

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Network Time Protocol (NTP) is easy to configure but full of little tricks and hard to troubleshoot (or at least I think so)! In this section I want to configure NTP in my sample topology.

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