Building Scalable Cisco Networks: Prepare for CCNP and CCDP by Catherine Paquet

By Catherine Paquet

I'd store your self it slow through trying to find different books. i used to be additionally daunted by means of this book's measurement and made up our minds to grasp the fabric exclusively according to prior stories. So I learn this booklet numerous instances and feature the next comments:

The association of OSPF fabric has the subsequent drawbacks: a) loss of context, the instructions are coated merely after a few conception is given in a dry definition shape. this is often nice, you could say, yet to me it was once demanding to place the definitions into context. the fabric for OSPF is generally from the Cisco OSPF layout consultant (read these skimpy pages to get the main figuring out of OSPF). So it seems like from the OSPF layout consultant, they seperated the idea and interspersed it with another textual content and moved the configuration in the direction of the bankruptcy finish. the second one OSPF bankruptcy calls for critical apology to the readers: inter zone routing and exterior routing are most unlikely to explain and make scholars comprehend with no introducing redistribution(this is brought basically on the end). notwithstanding, this makes the fabric super tricky to understand.

EIGRP is OK.

BGP is one other complicated set of definitions, and several other reads are wanted earlier than even attempting to piece jointly the definition and know how to place every little thing together.

So: for OSPF begin from OSPF layout consultant via Cisco. uncertain approximately the place to move for EIGRP and BGP: I bought a dangle of these fabric by way of numerous reads of the Paquet and Teare fabric.

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Extra resources for Building Scalable Cisco Networks: Prepare for CCNP and CCDP Certification with the Official Cisco BSCN Coursbook

Example text

It is important to note that the routers at the points of the star (R1, R2, and R3) are also configured with point-topoint subinterfaces, even though (unlike the central router, R4) they connect to only one VC. This is the best practice for all routing protocols (because it allows further VCs to be added without affecting the existing VC), but it is imperative to IS-IS. A main interface (for example, interface Serial 0) is a multipoint interface, even if it happens to have only one VC configured.

Table S-3 show ip route Command Description show ip route Command Description address (Optional) Address about which routing information should be displayed. mask (Optional) Argument for a subnet mask. longer-prefixes (Optional) The address and mask pair becomes a prefix, and any routes that match that prefix are displayed. protocol (Optional) Name of a routing protocol, or the keywords connected, static, or summary. If you specify a routing protocol, use one of the following keywords: bgp, egp, eigrp, hello, igrp, isis, ospf, or rip.

The best paths are inserted in the CLNS routing table (OSI forwarding database). OSI Routing Process Routing inside a Level 1 area is based on the system ID of the destination OSI (NSAP) address. Level 1–2 routers send default routes to the Level 1 routers in their area. When a Level 1 router has a packet that is destined for another area, the following rules apply: • The Level 1 router routes the packet to the nearest Level 1–2 router. The Level 1 router finds the closest exit point from the area, based on the best default route to the Level 1–2 routers in its area.

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