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[DCN]Q&A: What Are Differences Between the Internal and External Preferences of a Router?

Latest reply: May 21, 2019 06:27:05 487 5 12 3

Hello everyone,

Today I will share with you the differences between the internal and external preferences of a router.

Routers define external preference and internal preference. Value 0 indicates direct routes and value 255 indicates routes learned from unreliable sources. A smaller value indicates a higher preference. External preferences are manually configured for routing protocols. Table 1 lists the default external preferences of routing protocols.

Table 1 Routing protocols and their default external preferences

Routing Protocol or Route Type

Default External Preference

Direct

0

OSPF

10

IS-IS

15

Static

60

RIP

100

OSPF ASE

150

OSPF NSSA

150

IBGP

255

EBGP

255

During route selection, the device first compares the external preferences of routes. When the same external preference is set for different routing protocols, the device selects the optimal route based on the internal preference. Internal preferences of routing protocols cannot be manually configured. Table 2 lists the internal preferences of routing protocols.

Table 2 Internal preferences of routing protocols

Routing Protocol or Route Type

Internal Preference

Direct

0

OSPF

10

IS-IS Level-1

15

IS-IS Level-2

18

Static

60

RIP

100

OSPF ASE

150

OSPF NSSA

150

IBGP

200

EBGP

20

That is all I want to share with you! Thank you!

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Hi_Jude
Created May 21, 2019 02:34:42 Helpful(0) Helpful(0)

very helpful
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Bruce_005
Created May 21, 2019 02:35:53 Helpful(0) Helpful(0)

Good ! Thanks!
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jack.chen
Created May 21, 2019 02:36:40 Helpful(0) Helpful(0)

very helpful
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user0017
Created May 21, 2019 02:40:12 Helpful(0) Helpful(0)

very helpful
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Thanos_Marvell
Created May 21, 2019 06:27:05 Helpful(0) Helpful(0)

It's very helpful
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