Along the journey of learning Junos, you will run across different routing tables that are used for different purposes. Some tables make sense right away, but others take some digesting. I hope I can answer some questions that you might...
JNCIE, JNCIP, SERVICE PROVIDER
ISIS NARROW and WIDE METRICs
Today we will talk about ISIS narrow metrics and wide metrics, but as always, let me give you some background first. We start by looking at the ISIS PDUs (Packet Data Units), which is the term used to refer to...
ENTERPRISE, JNCIP, JNCIS
Spanning Tree Protocol Summary
TERMINOLOGY BRIDGE ID: 8 bytes ID that uniquely identifies each switchFor calculations purposes the first 2 bytes are treated as priority, while the next 6 bytes are the switch's MAC address: Priority is configured with: Junos default priority = 32,768Range: 0...
ENTERPRISE, JNCIA, JNCIE, JNCIP, JNCIS, SERVICE PROVIDER
OSPF SUMMARY
OSPF PACKET TYPES HELLO PACKETS Adjacencies formation: An adjacency could fail if there is a mismatch of any of the following parameters: MTU (stuck in exstart) Network address Subnet mask Hello interval and/or dead interval Area typeAuthenticationArea idInterface type (broadcast,...
JNCIP, JNCIS, SERVICE PROVIDER
MPLS=>RSVP=>CSPF
I was asked about the difference between RSVP and CSPF, and I thought: “hmm, that would probably be like comparing a car’s engine with the car’s GPS”. You definitively need the engine to go anywhere, but if you are like...
ENTERPRISE, JNCIA, JNCIS, SECURITY, SERVICE PROVIDER
AGGREGATE, & GENERATED Additional notes.
Got a very good questions from someone who read my article about MANUALLY CONFIGURED ROUTES: "What is the purpose of using discard with a generated route?" I didn't think much about it at first. I mean, traffic coming in that...
ENTERPRISE, JNCIA, JNCIP, JNCIS, SECURITY, SERVICE PROVIDER
Logical Systems and Virtual Routers
LSYS Virtual Routers Scaling Up to 15 10K+ Management Separation Yes No Independent Routing Process (rpd) Yes No Can allocate resources per instance Yes No Support Routing Protocols Yes Yes NSR, NSB supported No Yes License required (in some products)YesNo...
ENTERPRISE, JNCIA, JNCIS, SERVICE PROVIDER
Primary, preferred addreses.
Primary-preferred-address-examples_YL_MAY-2017Download
ENTERPRISE, JNCIE, JNCIP, SERVICE PROVIDER
OSPF vs. ISIS
Long ago, when I didn't know much about ISIS, and I mostly worked with customers running OSPF, I used to think of ISIS as a strange routing protocol, that nobody really cared much about. But I was sooo wrong! I...
JNCIE, JNCIP, SERVICE PROVIDER
JUNOS RIB-GROUPS (2/2)
Glad you came back for more rib-groups fun! We are now going to take a look at some applications of rib-groups that you might find interesting and applicable to your real networks. Warning: Brace for some extra topics! CASE 1...
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