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Troubleshooting Guide

CloudEngine 16800, 12800, 12800E, 8800, 7800, 6800, and 5800 Series Switches

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What Are Differences Between the Internal and External Preferences of a Router?

What Are 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 22-132 lists the default external preferences of routing protocols.

Table 22-132 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

Except the CE6810LI, other CE series switches in V100R006C00 and later versions allow users to manually configure the preference of direct routes. In addition, the preference of each static route varies.

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 22-133 lists the internal preferences of routing protocols.

Table 22-133 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

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Updated: 2020-01-07

Document ID: EDOC1000060766

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