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Beginner

Balanced scenario with two static routes without administrative distance.

Hi,

 

I'm configuring a 3750 switch with a ISP provider using MHSRP on its side. Actually I'm using two GigaEthernet connections.

I wanna create load balancing from my side using static routes but the traffic flows I see are not equal neither similar.

 

router# show run | begin iproute

[...]

ip route 10.0.0.0 255.255.0.0 10.255.255.1
ip route 10.0.0.0 255.255.0.0 10.255.255.6

[...]

 

router# show ip route

[...]
S*    0.0.0.0/0 [1/0] via 192.168.0.254
      10.0.0.0/16 is variably subnetted, 23 subnets, 5 masks
S        10.0.0.0/16 [1/0] via 10.255.255.6
                    [1/0] via 10.255.255.1

[...]

 

By the way ip cef is already activated

 

This is the result:

Interface 1

GigabitEthernet1  is up, line protocol is up (connected)

[...]

  Queueing strategy: fifo
  Output queue: 0/40 (size/max)
  5 minute input rate 35046000 bits/sec, 4638 packets/sec
  5 minute output rate 8671000 bits/sec, 3846 packets/sec

 

Interface 2

GigabitEthernet2 is up, line protocol is up (connected)
[...]
  Queueing strategy: fifo
  Output queue: 0/40 (size/max)
  5 minute input rate 1000 bits/sec, 2 packets/sec
  5 minute output rate 3859000 bits/sec, 1714 packets/sec

 

IP CEF:

router#show ip cef
Prefix               Next Hop             Interface
10.0.0.0/16           10.255.255.1         Vlan99
                     10.255.255.6         Vlan99

 

I have no more configuration on the interfaces. Shall I add ip load balacing per packet instruction?

Everyone's tags (2)
1 ACCEPTED SOLUTION

Accepted Solutions
VIP Mentor

By default cef uses per

By default cef uses per destination load balancing , set ip load balancing per packet  on the gig links try again , are your links equal to up  10 network each side

4 REPLIES 4
VIP Mentor

By default cef uses per

By default cef uses per destination load balancing , set ip load balancing per packet  on the gig links try again , are your links equal to up  10 network each side

CEF provides per destination

CEF provides per destination load balancing, In per-destination mode all packets for a given destination are forwarded along the same path. Per-packet load balancing guarantees equal load across all links, however potentially the packets may arrive out-of-order at the destination as differential delay may exist within the network.

Regards

Ali Gheidarpour

Beginner

Thank you both for that

Thank you both for that explanations.

VIP Expert

DisclaimerThe Author of this

Disclaimer

The Author of this posting offers the information contained within this posting without consideration and with the reader's understanding that there's no implied or expressed suitability or fitness for any purpose. Information provided is for informational purposes only and should not be construed as rendering professional advice of any kind. Usage of this posting's information is solely at reader's own risk.

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Posting

I just wanted to touch upon what Ali has already mentioned, using per-packet load balancing may result in out-of-order packet arrival.  Although IP doesn't guarantee packet delivery sequence, intentionally setting yourself up for out-of-sequence delivery, can be very injurious to your application traffic.  I.e. it's often much better to allow the less than ideal link balancing to avoid out-of-sequence packet delivery.

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