Cisco ASR 9006 Manual de usuario descargar pdf (Pagina 44)

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Presentation_ID

45

BGP PIC – one simple example

 On X1, it learn 250K routes from

BGP. Those 250K routes (Z1…Zn)

is in the “recursive” FIB leaf table,

since the next hop of the BGP

routes is the X2’s loopback

address, which is not directly

connected



On X1, it also learn the X2’s

loopback address route from IGP.

This route is in the “non-recursive”

FIB leaf table, since the next hop of

this route is the local interface

pointing to X4

Recursive

Prefix Leaf

Z1 … Z250,000

Non-Recursive

Prefix Leaf

X2

recursive

via X2

via X4

TenGig 1/0/0/0 Output I/F

Linecard Hardware FIB structures

Z

/z

AS X

AS Y

iBGP

eBGP

Y2

Y3

Y1

X1

X5

X4

X3

X2

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