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Route Refresh / Soft-reconfiguration Inbound on IOS

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This document explains behaviour of Cisco routers running IOS when configuring soft-reconfiguration Inbound

Possible scenarios:

1. - When the BGP neighbour is not route refresh capable:

1.1 No soft-reconfiguration inbound configured

1.2 Soft-reconfiguration inbound configured

2. - When the BGP neighbour is route refresh capable:

2.1 No soft-reconfiguration inbound configured

2.2 Soft-reconfiguration inbound configured

Descriptions and outputs

1. - No route refresh capability:


1.1 No soft-reconfiguration inbound configured

    • Route Refresh messages are not sent

R2#clear bgp all 65000 soft in                       

R2#

R2#


    • IOS-XR router won’t keep a copy of the bgp routing table

R2#sh bgp all neighbors 172.16.26.6 received-routes

For address family: IPv4 Unicast

% Inbound soft reconfiguration not enabled on 172.16.26.6

1.2 Soft-reconfiguration inbound configured

    • Route refresh messages are not sent

R2#clear bgp all 65000 soft in                       

R2#

R2#


    • IOS-XR router will keep a copy of the bgp routing table

R2#sh bgp all neighbors 172.16.26.6 received-routes

For address family: IPv4 Unicast

BGP table version is 31, local router ID is 172.16.102.1

Status codes: s suppressed, d damped, h history, * valid, > best, i - internal, r RIB-failure, S Stale Origin codes: i - IGP, e - EGP, ? - incomplete

   Network                   Next Hop            Metric LocPrf      Weight Path

*> 6.6.6.0/24             172.16.26.6              0                      0 65000 ?

*  172.16.26.0/24     172.16.26.6              0                      0 65000 ?

*> 172.16.30.0/24    172.16.26.6              0                      0 65000 ?

*> 172.16.106.0/24  172.16.26.6              0                      0 65000 ?

Total number of prefixes 4

2.- With Route refresh capability:


2.1 No soft-reconfiguration inbound configured

    • Route refresh messages will be sent when needed

R2#clear bgp all 65000 soft in                       

*Apr  1 13:51:18.035: BGP: 172.16.26.6 sending REFRESH_REQ(5) for afi/safi: 1/1

*Apr  1 13:51:18.035: BGP: 172.16.26.6 send message type 5, length (incl. header) 23


    • IOS-XR router won't keep a copy of the bgp routing table

R2#sh bgp all neighbors 172.16.26.6 received-routes

For address family: IPv4 Unicast

% Inbound soft reconfiguration not enabled on 172.16.26.6


2.2 Soft-reconfiguration inbound configured

    • Route refresh messages are not sent

R2#clear bgp all 65000 soft in                       

R2#

R2#


    • IOS-XR router will keep a copy of the bgp routing table

R2#sh bgp all neighbors 172.16.26.6 received-routes

For address family: IPv4 Unicast

BGP table version is 37, local router ID is 172.16.102.1

Status codes: s suppressed, d damped, h history, * valid, > best, i - internal, r RIB-failure, S Stale Origin codes: i - IGP, e - EGP, ? - incomplete

   Network                   Next Hop            Metric LocPrf     Weight Path

*> 6.6.6.0/24             172.16.26.6              0                     0 65000 ?

*  172.16.26.0/24     172.16.26.6              0                     0 65000 ?

*> 172.16.30.0/24    172.16.26.6              0                     0 65000 ?

*> 172.16.106.0/24  172.16.26.6              0                     0 65000 ?

Total number of prefixes 4

Regards

Nelson

Nelson Gull
Network Consulting Engineer
Advanced Services SP Mobile UKI

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Cisco Systems   Limited
200 Longwater Avenue
Green Park
Reading
Berkshire
RG2 6GB
United Kingdom
Cisco.com


Comments
blue phoenix
Beginner

Hi,

It is said that the soft reconfiguration inbound is deprecated.  I would like to know how can I see neighbor's advertised route if I would not configured the soft reconfiguration inbound?

 

 

Thanks,