Cisco

Frame Relay Notes - DE, FECN, and BECN

2011-06-23 ·2 min read

All are part of the frame relay congestion management suite. Frame relay switches monitor links for CIR or oversubscription congestion on links. If the VC has a CIR of 256k, the switch knows there is …

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Frame Relay Notes - LMI, Headers, and Encapsulation

2011-06-23 ·1 min read

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 …

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PPP Notes - LFI

2011-06-23 ·1 min read

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 …

350-001 ccie fragmentation interleaving lfi link multilink ppp written

Redistribution Notes - AD Manipulation

2011-06-22 ·1 min read

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 …

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Redistribution Notes - Tagging

2011-06-20 ·2 min read

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 …

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CCIE R&S Written Materials

2011-06-13 ·2 min read

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 …

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BGP Notes - Backdoor Routes

2011-06-11 ·1 min read

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, …

350-001 backdoor bgp notes routes

BGP Notes - Confederations

2011-06-11 ·2 min read

RFC 3065 BGP confederations reduce the size of full mesh iBGP ASes by dividing it up into different areas. Confederations also remove the need for BGP synchronization since all iBGP routers will have …

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BGP Notes - Route Reflectors

2011-06-11 ·1 min read

Route reflectors remove the requirement of having a full mesh iBGP network. Any iBGP route a router reflector learns is sent to all route reflector clients. Non-client iBGP neighbors do not get the …

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BGP Notes - Synchronization

2011-06-11 ·1 min read

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 …

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