> For the complete documentation index, see [llms.txt](https://sefa-memis.gitbook.io/blog/llms.txt). Markdown versions of documentation pages are available by appending `.md` to page URLs; this page is available as [Markdown](https://sefa-memis.gitbook.io/blog/nokia-mpls/isis.md).

# ISIS

Developed by the Cisco \
Link state routing protocol\
Uses the Djkstra Algoritm\
Not based on IP\
Integrated IS-IS supports IP\
Level-1 Routing: Within an area\
Level-2 Routing: Between areas

<figure><img src="/files/1UmIGmrMBxW4yfxc6zYa" alt=""><figcaption></figcaption></figure>

İnterface tanımlarını yaptıktan sonra isis tanımlarını yapacağız.

```
R2(config)#router isis 
R2(config-router)#is-type level-1
R2(config-router)#net ?
XX.XXXX. ... .XXX.XX  Network entity title (NET)
R2(config-router)#net 11.1111.1111.1111.1111.00

//İnterface altında isis konfigurasyonunu aktif ediyoruz.
R2(config)#interface fastEthernet 0/0
R2(config-if)#ip router isis
R2(config-if)#no shut


R3(config)#router isis
R3(config-router)#is-type level-1-2
R3(config-router)#net 11.1111.2222.2222.2222.00
R3#conf t
R3(config)#interface fastEthernet 0/0
R3(config-if)#ip router isis
R3(config-if)#no shut

R4(config)#router isis
R4(config-router)#is-type level-1-2
R4(config-router)#net 22.2222.3333.3333.3333.00
R4#conf t
Enter configuration commands, one per line.  End with CNTL/Z.
R4(config)#interface fa0/0
R4(config-if)#ip router isis

R4(config-if)#interface fa4/0
R4(config-if)#ip router isis


R5(config)#router isis
R5(config-router)#is-type level-1
R5(config-router)#net 22.2222.4444.4444.4444.00
R5(config-router)#exit
R5(config)#interface fa2/0
R5(config-if)#ip router isis

R4#sh isis neighbors

System Id      Type Interface   IP Address      State Holdtime Circuit Id
R5             L1   Fa4/0       203.0.113.5     UP    8        R5.01


```

### Örnek 2


---

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