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IS-IS ROUTING PROTOCOL CONFIGURATION ON JUNIPER

IS-IS ROUTING PROTOCOL

(Intermediate System-to-Intermediate System)

*Link state ​​ protocol​​ ve IGP​​ protocol and​​ runs over​​ ​​ CLNS​​ 

*ISIS​​ doen not have phsichal​​ (Necessary for​​ Ospf )

*Can support ​​ 1000 router​​ in​​ IS-IS area ​​ ​​ ​​ . (OSPF 50​​ only​​ )

*Using​​ PARTIACL ROUTE Calculation (rpc)​​ algorithma​​ ​​ in IS-IS ip routing table​​ 

Use​​ SPF algorithm for connection to neighbors.

*It is possible so mye configuration ​​ than OSPF​​ 

*Using OSI Model ​​ (IS-IS​​ )​​ 

*Use​​ MD5 authentication​​ 

Send​​ ​​ ``IS HELLO`` packets to neighbors

 

IS IS LEVELS

L1​​ (Routers)​​ :​​ For comminaction same​​ ​​ areas​​ 

L2​​ (Routers):​​ communication with​​ L2 ve L1 /L2, backbone /transit level

L1 / L2​​ (Routers):Can communication​​ L1​​ and​​ L2​​ 

 

CLNS (Connection ​​ Less mode Newtwork Service) ​​ Types

*Clns operates at layer 3

*Clnp and TP4 are layer 4 protocols

 

 

Important: IS-IS ​​ developed by DEC.

*IS-IS ​​ using NSAP ​​ Addressing​​ 

*IS-IS lsdb are built using LSPs (Link state Pdus ) and IS-IS can have 1 or 2 database on a router

 

There are 3 categories of IS-IS PDU

Hello PDUs

Link state PDUs

Sequence Number PDUs

 

TLV TYPES

Type 1​​ :Area Address

Type 2​​ :​​ IIS neighbors

Type 6:system neighbor

Type 8:​​ Padding​​ 

Types 10 :​​ Authentication

Type 128:​​ ip internal Reachability

Types 129

Types 130

Type 211: Restart

 

LSP TYPES

LSP1

LSP2​​ 

 

*PDU​​ :are sent every 9 seconds default but can be change

 

IS-IS DEFAULT METRICS

Doe not take into account speed

All physical interfaces have metric of 10

Loopback interfaces have a metric of 0

DEault Metric cost for main link:​​ 1 GB

Backup link is​​ 10 MB

***Max metric​​ for IS IS is 1023

IS-IS level 1 internal​​ route:15

IS-IS level 2 internal​​ route :18

IS-IS level 1 external​​ route:160

IS-IS level 2 external​​ route:165

 

Metric s for ISIS

Delay

Error

Expense

 

 

Configuration

 

At​​ Srx1​​ 

Edit protocols isis

Set interface fe 0/0/0.0

Set interfaces fe 0/0/1.0

Set interfaces fe 0/0/7.0

Top

Edit interfaces

Set interface fe 0/0/0.0 family iso

Set interface fe 0/0/1.0 family iso

Set interface fe 0/0/7.0 ​​ family iso

Commit

At​​ Srx3​​ 

Edit protocols isis

Set interface fe 0/0/0.0

Top

Edit interfaces

Set interface fe 0/0/0.0 family iso

Commit

 

Show route protocol isis

 

CREATING AREAS