BGP PICS on ASR920

[lorenzo limardo]

Hello,

I would like to know if ASR920 may support full BGP  table.

According to this document should be possible by the BGP PICS opening full tables for 5 min.

How does the BGP PICS works?

Also looks lik from EVEREST 16 is possible to support FULL BGP?

Necessity is 1/2 ports 1 GBE, maybe additional migration 1 port 10GBE

Thanks a lot for precious help

https://www.cisco.com/c/en/us/td/docs/routers/asr920/configuration/guide/iproute/16-9-1/b-irg-xe-16-9-asr920/b-irg-xe-16-9-asr920_chapter_00.html

https://www.cisco.com/c/en/us/td/docs/routers/asr920/configuration/guide/iproute/irg-xe-3s-asr920-book.html#reference_FD82054A32F34CADBCAF2CCE1FFAC751

How BGP PIC Improves Upon the Functionality of MPLS VPN–BGP Local Convergence

The BGP PIC feature is an enhancement to the MPLS VPN–BGP Local Convergence feature, which provides a failover mechanism that recalculates the best path and installs the new path in forwarding after a link failure. The feature maintains the local label for 5 minutes to ensure that the traffic uses the backup/alternate path, thus minimizing traffic loss.

The BGP PIC feature improves the LoC time to under a second by calculating a backup/alternate path in advance. When a link failure occurs, the traffic is sent to the backup/alternate path.

When you configure the BGP PIC feature, it will override the functionality of the MPLS VPN--BGP Local Convergence feature. You do not have to remove the protection local-prefixes command from the configuration.

[paul driver · Accepted solution]

Hello

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@lorenzo limardo wrote:

Hello,

I would like to know if ASR920 may support full BGP  table.

According to this document should be possible by the BGP PICS opening full tables for 5 min.

How does the BGP PICS works?

Also looks lik from EVEREST 16 is possible to support FULL BGP?

Necessity is 1/2 ports 1 GBE, maybe additional migration 1 port 10GBE

---

This router looks like it supports a maximum of 20,000 ipv4/ipv6 routes so given that bgp table is up around 700,000 I guess not.

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How BGP PIC Improves Upon the Functionality of MPLS VPN–BGP Local Convergence

The BGP PIC feature is an enhancement to the MPLS VPN–BGP Local Convergence feature, which provides a failover mechanism that recalculates the best path and installs the new path in forwarding after a link failure. The feature maintains the local label for 5 minutes to ensure that the traffic uses the backup/alternate path, thus minimizing traffic loss.

The BGP PIC feature improves the LoC time to under a second by calculating a backup/alternate path in advance. When a link failure occurs, the traffic is sent to the backup/alternate path.

When you configure the BGP PIC feature, it will override the functionality of the MPLS VPN--BGP Local Convergence feature. You do not have to remove the protection local-prefixes command from the configuration.

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This is a bgp convergence feature it has nothing to do with the router being able to support a full bgp table.

[lorenzo limardo]

thanks a lot really helpful

[lorenzo limardo]

Thanks a lot, really helpful.

[srmiller]

There is a way to get the full routing table into an ASR920.  Follow this doc:

https://www.cisco.com/c/dam/en/us/products/collateral/routers/asr-920-series-aggregation-services-router/asr920-full-internet-routing-capability.pdf

I've done it fine, no issues:

gb920-gw-01#show bgp sum
..
..
Neighbor V AS MsgRcvd MsgSent TblVer InQ OutQ Up/Down State/PfxRcd
xx.xx.xx.xx 4 <asn> 562265 2774 2353823 0 0 1d17h 767075
xx.xx.xx.xx 4 <asn> 562163 2768 2353823 0 0 1d17h 767075
gb920-gw-01#