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Frame Relay Notes - LMI, Headers, and Encapsulation

Local Management Interface * Manages link between the router and frame relay switch * Routers send Status Enquiry to the switch * The switch responds with a Status message informing the router of the DLCIs available * Serves as a keepalive * Default keepalive is 10 seconds, 3 misses is failed * Three types * cisco <

PPP Notes - LFI

* Link Fragmentation and Interleaving * A QoS tool to prevent smaller, higher-priority packets from waiting on larger packets to transmit * For example, VoIP packets and FTP packets * Fragments the larger packets and interleaves them with the smaller packets * Only available in PPP with Multilink * Can be a multilink bundle with a

Redistribution Notes - AD Manipulation

* Manipulating administrative distance (AD) is another way to help with a mutual redistribution scenario. * EIGRPs has different ADs for internal and external (redistributed) routes * OSPF and RIP have the same AD no matter where the route orginated. * This means that routes redistributed into OSPF may be used instead of a

Redistribution Notes - Tagging

* Tagging provides a way to mark common or similar routes to manipulate later. * In redistribution scenarios with mutual redistribution on two different routers, any routes that gets redistributed from one route process to another are tagged. * When the other router sees those tags on the route, that route to keep

CCIE R&S Written Materials

I’m scheduled to take the CCIE R&S Written exam on 10 July at Cisco Live, and I’ve been asked by a handful of people on Twitter exactly what materials I’m using. I figured it would be a good idea to let everyone know so that

BGP Notes - Synchronization

* With synchronization on, route must be synchronized to an IGP in order for that routes to be able to be voted ‘best” by BGP. * That means the exact route must already be in the routing table via an IGP. * Static routes don’t count. * This is traditionally accomplished by redistributing

BGP Notes - Backdoor Routes

* The fact that eBGP has an AD of 20 can be a problem. * You may have a very short path via EIGRP (or OSPF or RIP or whatever other IGP), but the longer eBGP path will be preferred. * For God’s sake, do not lower the AD of EIGRP! Havoc