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archives

The first CCIE Journey

This category contains 6 posts

IP Multicast to MAC Address Mapping

Map Multicast MAC address to IP Multicast Addresses In the course of reading through the BSCI authorize self-study guide, I’ve come across a multicast example where the author talks about the concepts behind the multicast IP to MAC address mapping. In order to achieve the translation between a Layer 3 IP multicast address and Layer 2 … Continue reading

Building a CCIE mind-set

What It take to become a CCIE The road to becoming a CCIE is long and winding , with a lot of larger hills along the way. You need to have a certain mind-set to undertake such a journey. As you travel down the road, you need adapt and embrace the challenges that lie ahead

Cisco released XRv – Good news for ccie sp

Cisco IOS XRv Router The Cisco IOS XRv Router is a Virtual Machine (VM) based platform running 32-bit IOS XR software with the QNX microkernel. This VM contains a single route processor (RP) with control plane functionality, and line card (LC) network interfaces with their associated functionality. It is a representation of the IOS XR … Continue reading

BGP Synchronization

If your AS passes traffic from another AS to a third AS, BGP should not advertise a route before all routers in your AS learn about the route via IGP. BGP waits until IGP propagates the route within the AS and then advertises it to external peers. A BGP router with synchronization enabled does not … Continue reading

The BGP neighbor states

BGP forms a unique, unicast-based connection to each of its BGP-speaking peers. To increase the reliability of the peer connection, BGP uses TCP (port 179) as its underlying delivery mechanism. The update mechanisms of BGP are also somewhat simplified by allowing the TCP layer to handle such duties as acknowledgment, retransmission, and sequencing. Because BGP … Continue reading

IS-IS Rules

ISO Network Entity Title (NET) Three of the different formats that an ISO NET can take: (a) An 8-octet area IS/system ID format    07.000.3090.c7df.00 (b) An OSI NSAP format                             47.0004.30ac.0007.0000.3090.c7df.00 (c)  A GOSIP NSAP format                         47.0005.80.0000a7.0000.ffdd.0007.0000.3090.c7df.00 Rules for Creating a NET • The NET must begin with a single octet. • Addresses starting with 49 (AF I= … Continue reading

DIS and the Pseudonode

What is the DIS? On broadcast multi-access networks, a single router is elected as the DIS. There is no backup DIS elected. The DIS is the router that creates the pseudonode and acts on behalf of the pseudonode. Two major tasks are performed by the DIS: Creating and updating pseudonode LSP for reporting links to … Continue reading

Connectionless-mode Network Service (CLNS) ?

Connectionless-mode Network Service Connectionless-mode Network Service (CLNS) or simply Connectionless Network Service is an OSI Network Layer datagram service that does not require a circuit to be established before data is transmitted and routes messages to their destinations independently of any other messages.[1][2] As such it is a “best-effort” rather than a “reliable” delivery service. … Continue reading

IS-IS Protocol

IS-IS Standards History  ISO 10589 specifies OSI IS-IS routing protocol for CLNS traffic Tag/Length/Value (TLV) options to enhance the protocol A Link State protocol with a 2 level hierarchical architecture.  RFC 1195 added IP support I/IS-IS runs on top of the Data Link Layer Requires CLNP to be configured  RFC5308 adds IPv6 … Continue reading

How many ccie in the world ?

I want , and doing add me to gold list 🙂 Here, i really begin to  start professional in ICT. That is my life