Comware

 View Only
last person joined: 5 days ago 

Expand all | Collapse all

loadsharing of vpnv4 trafic between BGP peers (on 5930)

This thread has been viewed 0 times
  • 1.  loadsharing of vpnv4 trafic between BGP peers (on 5930)

    Posted Jul 30, 2021 10:20 AM

    I have several 5930 (Commware 7 R26xx) with BGP vpnv4 address family peering, and I see that if trafic originating from a switch is indeed spread among the links, trafic onlyu transiting (thus I think the label routing) only uses one of the link.

    dis bgp routing-table vpnv4 outlabel shows several outlabel per route (one per peer) but dis bgp routing-table vpnv4 inlabel shows only one.

    What would be the best way to achieve load sharing between the different lionks ? (4 links between 2 switches, each with it's bgp peering, in IPv4 address family ecmp works fine with a balance ecmp 4)


    #BGP
    #mpls
    #BGPMPLSloadsharing
    #loadsharing


  • 2.  RE: loadsharing of vpnv4 trafic between BGP peers (on 5930)

    EMPLOYEE
    Posted Jul 30, 2021 11:16 AM

    Hi @Er_DA 

    You can achieve load sharing between the different links by configuring AS_Path prepend OR local preference attribute on link for incoming routes.



  • 3.  RE: loadsharing of vpnv4 trafic between BGP peers (on 5930)

    Posted Aug 03, 2021 03:55 AM

    Ok, I did not explain very weel : see that diagram

    pe_mpls_pe.png

     

    When trafic is injected in the MPLS network at PE1, using ebgp balance config, it uses both links. However, at MPLS routers, all traffic is sent on only one link. I'd like all links to be used. MPLS.

    Setup is done with MP-BGP and the vpnv4/vpnv6 address families. I found mentions of additional-paths and vpn-route cross multipath , but in H3C commware docs, not on HPE ones

    AS prepend and local preference are useful to get priority of trzfic, not using several equivalent (same cost) links.

     



  • 4.  RE: loadsharing of vpnv4 trafic between BGP peers (on 5930)

    EMPLOYEE
    Posted Aug 03, 2021 08:25 AM

    Hello Er_DA,

    Please use the following links in regards to your question:

    Enabling ECMP VPN route redistribution (hpe.com)

    Following is the link to the MPLS guide:

    HPE FlexFabric 5940 & 5930 Switch Series MPLS Configuration Guide

    Under following sections and chapters as indicated below you can find more information:

    Overview > ECMP VPN route redistribution

    and 

    Configuring MPLS L3VPN > MPLS L3VPN configuration task list

     

    and 

    Configuring MPLS L3VPN > Enabling ECMP VPN route redistribution

    Hope this helps!



  • 5.  RE: loadsharing of vpnv4 trafic between BGP peers (on 5930)

    Posted Aug 05, 2021 06:16 AM

    Thanks for the Tip.

    I tried it, but no change in the trafic pattern.

    I also tried to add in the vpnv4 address family

    peer <name> additional-paths send-receive
    additional-paths select-best 2

    Did not change anything either.

    Obviously I tried reseting bgp after changong configuration, same result.