Juniper JUNOSE 11.2.X BGP AND MPLS User Manual

host4(config-router)#network 192.168.204.0 mask 255.255.252.0
host4(config-router)#redistribute isis
Consider how route 172.21.10.0/23 is passed along to the routers in Figure 33 on page 115:
1. IS-IS injects route 172.21.10.0/23 from router Chicago into BGP on router LA. BGP
sets the origin attribute to Incomplete (because it is a redistributed route) to indicate
how BGP originally became aware of the route.
2. Router Boston learns about route 172.21.10.0/23 by means of EBGP from router LA.
3. Router NY learns about route 172.21.10.0/23 by means of IBGP from router Boston.
The value of the origin attribute for a given route remains the same, regardless of where
you examine it. Table 20 on page 116 shows this for all the routes known to routers NY
and LA.
Table 20: Origin and AS Path for Routes Viewed on Different Routers
AS PathOriginRouterRoute
300IGPAlbany192.168.204.0/22
300IGPBoston192.168.204.0/22
300IGPNY192.168.204.0/22
emptyIGPLA192.168.204.0/22
300IncompleteAlbany172.21.10.0/23
300IncompleteBoston172.21.10.0/23
300IncompleteNY172.21.10.0/23
emptyIncompleteLA172.21.10.0/23
emptyIGPAlbany172.28.8.0/21
emptyIGPBoston172.28.8.0/21
emptyIGPNY172.28.8.0/21
100IGPLA172.28.8.0/21
emptyIncompleteAlbany172.31.125.100
emptyIncompleteBoston172.31.125.100
emptyIncompleteNY172.31.125.100
100IncompleteLA172.31.125.100
Copyright © 2010, Juniper Networks, Inc.116
JunosE 11.2.x BGP and MPLS Configuration Guide

Juniper JUNOSE 11.2.X BGP AND MPLS Specifications

General

Brand	Juniper
Model	JUNOSE 11.2.X BGP AND MPLS
Category	Software
Language	English