Flow Tools AS-Path

Tue Apr 4 15:13:33 UTC 2023

Hi,

Extreme also supports it, and we use it for conducting statistics against dst_as/dst_peer_as to perform "traffic engineering" specifically for the transit paths. dst_as_path can also identify possible future peering situations or undesirable paths.

BR
Jörg

On 4 Apr 2023, at 16:48, Peter Phaal wrote:

> Export of destination AS-Path is supported in the sFlow extended_gateway
> structure.
>
> /* Extended Gateway Data */
> /* opaque = flow_data; enterprise = 0; format = 1003 */
>
> struct extended_gateway {
>    next_hop nexthop;           /* Address of the border router that should
>                                   be used for the destination network */
>    unsigned int as;            /* Autonomous system number of router */
>    unsigned int src_as;        /* Autonomous system number of source */
>    unsigned int src_peer_as;   /* Autonomous system number of source peer */
>    as_path_type dst_as_path<>; /* Autonomous system path to the destination */
>    unsigned int communities<>; /* Communities associated with this route */
>    unsigned int localpref;     /* LocalPref associated with this route */
> }
>
> Arista EOS supports aspath if you enable sflow extension bgp. Cisco
> also claims to support the feature on IOS XR platforms.
>
> In addition to BGP, there are a number of MPLS, tunnel encap/decap
> etc. sFlow extended structures.
>
> Also optical interface metrics, dropped packet notifications, and more:
>
> https://sflow.org/developers/specifications.php
>