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Mounir Mohamed

Over a decade of experince in networking business, ranging from service provider to networking vendors, Specialized in IP routing protocols and MPLS applications. CCIE(SP&RS) and JNCIE-SP.

IS-IS DIS in Practice

In the previous post IS-IS Neighbor Discovery we have discussed how IS-IS automatically discovers neighbors, in this post we will discuss the DIS role in broadcast networks. After the adjacency state reached the UP state the DIS election process take place, the router with the highest priority value (0-127 specified …

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IS-IS Neighbor Discovery

Like other routing and signaling protocols IS-IS has built-in automatic neighbor discovery mechanism which is known by IIHs (IS-IS Hello PDUs), because IS-IS is not IP based protocol the IIH PDUs and all other IS-IS PDUs are directly encapsulated on the data-link layer. IS-IS has two hierarchical levels (L1 and …

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IS-IS MTU Mismatch

IS-IS is a link-state routing protocol, it uses the concept of distributed map/database and local computation , each router originates an LSP to describes himself , this LSP carries links and topological information, reach router on the domain generates its own LSP and relays other routers LSPs untouched (With respect …

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BGP 4-Byte ASN

The internet growth is awesome, day by day people recognizes how  internet is important in their daily personal  and business life and even for their culture, so the internet has a good bit of newbie everyday which depleted some internet resources such as IPv4 address space and the BGP AS …

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MPLS Special Labels

MPLS label range from 0 to 1,048,575 (configurable on Cisco IOS) Labels 0 through 15 are reserved labels. An LSR cannot use them in the normal case for forwarding packets, the labels from 16 through 1,048,575 are used for normal packet forwarding. In Cisco IOS, the default range is 16 …

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Static Routes Label Binding

In this post we will be discussing the label binding for static routes and the forwarding of labeled packets destined to these destinations. IP routing protocols build the IP routing table, and each LSR assigns a label to every destination in its IP routing table independently (Independent LSP Control – …

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