Routing

Good day all,

I am very new to this communtiy and am really hoping to get some help with the problem I am facing in load balancing our ISP outgoing traffic.

We have an M10i with 4 equal cost STM-1 routes to our service provider, Namibia Telecom. Incoming traffic is load balancing very nicely ,but for some reason I am not sure of, BGP selects only one path for outbound traffic. (Attached is the router config- attention is on BGP group NAMIBIA TELECOM)

zamtel@ZMT-ZM-LMY-PR-001> show route 0.0.0.0

inet.0: 6017 destinations, 6507 routes (3445 active, 0 holddown, 2584 hidden)
+ = Active Route, - = Last Active, * = Both

0.0.0.0/0 *[BGP/170] 1d 07:34:26, localpref 100, from 41.205.152.182
AS path: 20459 I
> to 41.205.146.61 via so-0/1/0.0
to 41.205.146.65 via so-0/1/1.0
to 41.205.146.49 via so-1/0/0.0
to 41.205.146.57 via so-1/0/1.0

The current BGP config uses multihop with static routes to our peers loopback address. Attempts to use 'multipath', 'load balancing per-packet' and applying the outbound policy in the forwarding table have failed. I still get outbound traffic going through one interface.

Kindly have a look at the config attached and please advise where I am going wrong.

I would be extremely grateful for any assistance/advice.

aanyoti

Attachment(s)

ZMT-ZM-LMY-PR-001.txt   15 KB 1 version

Hello,

I am guessing that all 4 nexthops for Your 0/0 route are also resolved via BGP routes coming into Your router via so-1/0/0.

Please post the following printouts:

show route 0/0 extensive | no-more
show route 41.205.146.61 extensive | no-more
show route 41.205.146.65 extensive | no-more
show route 41.205.146.49 extensive | no-more
show route 41.205.146.57 extensive | no-more

 HTH

Thanks
Alex

Hi Alex,

Thank you for your response, find attached the show route outputs you requested.

Anthony.

Attachment(s)

41.205.146.x extensive.txt   2 KB 1 version

0 extensive.txt   5.37 MB 1 version

Hello there,

Right, here You go:

1/ I don't see a proper forwarding-table policy. Please configure following:

set policy-options policy-statement pplb term 1 from route-filter 0/0 exact
set policy-options policy-statement pplb term 1 then load-balance per-packet
set routing-options forwarding-table export pplb

 Using "load-balance per-packet" in BGP policies does nothing.

2/ Your 0/0 route has 1 protocol nexthop and 4 forwarding nexthops

Path 0.0.0.0 from 41.205.152.182 Vector len 4.  Val: 1
        *BGP    Preference: 170/-101
                Next hop type: Indirect
                Next-hop reference count: 2561
                Source: 41.205.152.182
                Next hop type: Router, Next hop index: 1048581
                Next hop: 41.205.146.61 via so-0/1/0.0, selected
                Next hop: 41.205.146.65 via so-0/1/1.0
                Next hop: 41.205.146.49 via so-1/0/0.0
                Next hop: 41.205.146.57 via so-1/0/1.0
                Protocol next hop: 41.205.152.182

 In absense of forwarding-table policy the traffic will take only 1 forwarding next-hop (marked as "selected").

HTH

Thanks

Alex

Hi Alex,

Thanks for this. I will implement the configs and give feedback, thanks again.

(P.S I assume "pplb" stands for per packet load balancing?)

Regards

Anthony

Hello,

pplb is just the name of the policy. You can use any alphanumeric combo You fancy to name the policy like "lbPp" or "Per-pACKET-Load-bALANC1NG"  or else.

Just remember You have to reference the policy by name so short mnemoci name like pplb is usually a vote winner.

HTH

Thanks

Alex 

Hi Alex,

THANKYOUUUUUUUU!!!!!!! It has worked! I truly appreciate it, am so overjoyed !!!!

Your a network saver !!!

Thanks again, its really much appreciated.

Kind Regards

Anthony