«

I'm trying to load share on a Cisco3640.

I tried the following, but all the packets
want to use the z.z.z.z connection only.

!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!! !!!!!!!!!!!
!
ip route x.x.x.0 255.255.255.0 z.z.z.z
ip route x.x.x.0 255.255.255.0 y.y.y.y
!
!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!! !!!!!!!!!!!

Is there not an easy way of telling the
packets to use BOTH gateways?

I don't think you can do load-sharing with static routes. You need to
use a routing protocol that support load sharing.

Doan

On Fri, 10 Sep 2004, Captain wrote:

> I'm trying to load share on a Cisco3640.
>
> I tried the following, but all the packets
> want to use the z.z.z.z connection only.
>
> !!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!! !!!!!!!!!!!
> !
> ip route x.x.x.0 255.255.255.0 z.z.z.z
> ip route x.x.x.0 255.255.255.0 y.y.y.y
> !
> !!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!! !!!!!!!!!!!
>
> Is there not an easy way of telling the
> packets to use BOTH gateways?
>
>

Captain wrote:

> I'm trying to load share on a Cisco3640.
>
> I tried the following, but all the packets
> want to use the z.z.z.z connection only.
>
> !!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!! !!!!!!!!!!!
> !
> ip route x.x.x.0 255.255.255.0 z.z.z.z
> ip route x.x.x.0 255.255.255.0 y.y.y.y
> !
> !!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!! !!!!!!!!!!!
>
> Is there not an easy way of telling the
> packets to use BOTH gateways?

It should do so by default, unless all your packets have the *exact*
same destination. IOS does per-destination loadsharing by default when
fast switching is enabled, so all packets for the same host will always
take the same path.

Two ways around this:

Disable fast switching ('no ip route-cache'). And watch your router go
into meltdown if you have serious traffic...

Run CEF ('ip cef') and run with 'ip load-sharing per-packet'.

But the answer might be simpler than that. is the y.y.y.y route *in the
routing table*? I.e. does it show up in 'show ip route'? Perhaps y.y.y.y
isn't reachable for some reason, and the z.z.z.z route is the only one
that actually works.

Regards,

Marco.

Doan wrote:

> I don't think you can do load-sharing with static routes. You need to
> use a routing protocol that support load sharing.

Nope. Statics will load-share just fine.

Regards,

Marco.

Also many people forget this will only result in OUTBOUND traffic being
load-shared, unless you have same setup on the connected routers.


"M.C. van den Bovenkamp" <> wrote in message
news:41424195$0$92786$4a ll.nl...
> Captain wrote:
>
> > I'm trying to load share on a Cisco3640.
> >
> > I tried the following, but all the packets
> > want to use the z.z.z.z connection only.
> >
> > !!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!! !!!!!!!!!!!
> > !
> > ip route x.x.x.0 255.255.255.0 z.z.z.z
> > ip route x.x.x.0 255.255.255.0 y.y.y.y
> > !
> > !!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!! !!!!!!!!!!!
> >
> > Is there not an easy way of telling the
> > packets to use BOTH gateways?
>
> It should do so by default, unless all your packets have the *exact*
> same destination. IOS does per-destination loadsharing by default when
> fast switching is enabled, so all packets for the same host will always
> take the same path.
>
> Two ways around this:
>
> Disable fast switching ('no ip route-cache'). And watch your router go
> into meltdown if you have serious traffic...
>
> Run CEF ('ip cef') and run with 'ip load-sharing per-packet'.
>
> But the answer might be simpler than that. is the y.y.y.y route *in the
> routing table*? I.e. does it show up in 'show ip route'? Perhaps y.y.y.y
> isn't reachable for some reason, and the z.z.z.z route is the only one
> that actually works.
>
> Regards,
>
> Marco.
>

Ben wrote:

> Also many people forget this will only result in OUTBOUND traffic being
> load-shared, unless you have same setup on the connected routers.

Very true. But that wasn't how I read his problem, although it might be;
depends on what he means by 'all the packets want to use the z.z.z.z
connection only'.

Regards,

Marco.

On Sat, 11 Sep 2004 02:06:42 +0200, "M.C. van den Bovenkamp"
<> wrote:

>Captain wrote:
>
>> I'm trying to load share on a Cisco3640.
>>
>> I tried the following, but all the packets
>> want to use the z.z.z.z connection only.
>>
>> !!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!! !!!!!!!!!!!
>> !
>> ip route x.x.x.0 255.255.255.0 z.z.z.z
>> ip route x.x.x.0 255.255.255.0 y.y.y.y
>> !
>> !!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!! !!!!!!!!!!!
>>
>> Is there not an easy way of telling the
>> packets to use BOTH gateways?
>
>It should do so by default, unless all your packets have the *exact*
>same destination. IOS does per-destination loadsharing by default when
>fast switching is enabled, so all packets for the same host will always
>take the same path.
>
==================================================

Yes, the exact same destination.

==================================================
>
>Two ways around this:
>
>Disable fast switching ('no ip route-cache'). And watch your router go
>into meltdown if you have serious traffic...
>
==================================================

I'm not sure what "serious traffic" is, but I would say YES, this
production router has a LOT of traffic on it!!

==================================================
>
>Run CEF ('ip cef') and run with 'ip load-sharing per-packet'.
>
==================================================

Do to the other configuration on this router,(which I'm trying not
to mess up), I can't seem to get 'ip load-sharing per-packet' to
do anything?

==================================================
>
>But the answer might be simpler than that. is the y.y.y.y route *in the
>routing table*? I.e. does it show up in 'show ip route'? Perhaps y.y.y.y
>isn't reachable for some reason, and the z.z.z.z route is the only one
>that actually works.
>
==================================================

Yes, both the yyyy and zzzz are there,(and working fine when
left on their own)....

==================================================
>
> Regards,
>
> Marco.

On Sat, 11 Sep 2004 12:11:27 GMT, "Ben" <> wrote:

>Also many people forget this will only result in OUTBOUND traffic being
>load-shared, unless you have same setup on the connected routers.
>
================================================== =====

Yes, I have the load-sharing working from the other end...

================================================== =====
>
>"M.C. van den Bovenkamp" <> wrote in message
>news:41424195$0$92786$4 all.nl...
>> Captain wrote:
>>
>> > I'm trying to load share on a Cisco3640.
>> >
>> > I tried the following, but all the packets
>> > want to use the z.z.z.z connection only.
>> >
>> > !!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!! !!!!!!!!!!!
>> > !
>> > ip route x.x.x.0 255.255.255.0 z.z.z.z
>> > ip route x.x.x.0 255.255.255.0 y.y.y.y
>> > !
>> > !!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!! !!!!!!!!!!!
>> >
>> > Is there not an easy way of telling the
>> > packets to use BOTH gateways?
>>
>> It should do so by default, unless all your packets have the *exact*
>> same destination. IOS does per-destination loadsharing by default when
>> fast switching is enabled, so all packets for the same host will always
>> take the same path.
>>
>> Two ways around this:
>>
>> Disable fast switching ('no ip route-cache'). And watch your router go
>> into meltdown if you have serious traffic...
>>
>> Run CEF ('ip cef') and run with 'ip load-sharing per-packet'.
>>
>> But the answer might be simpler than that. is the y.y.y.y route *in the
>> routing table*? I.e. does it show up in 'show ip route'? Perhaps y.y.y.y
>> isn't reachable for some reason, and the z.z.z.z route is the only one
>> that actually works.
>>
>> Regards,
>>
>> Marco.
>>
>

On Sat, 11 Sep 2004 15:10:04 +0200, "M.C. van den Bovenkamp"
<> wrote:

>Ben wrote:
>
>> Also many people forget this will only result in OUTBOUND traffic being
>> load-shared, unless you have same setup on the connected routers.
>
>Very true. But that wasn't how I read his problem, although it might be;
>depends on what he means by 'all the packets want to use the z.z.z.z
>connection only'.
>


Load-sharing seems to work from the other end, because when I
do a traceroute, packets go route1 the first time, route2 the second
time, route1 the third time,...., etc.....

But when I do a traceroute from the problem end, the first hop is
always the z.z.z.z route.

Also, every second ping,(on the traceroute after the z.z.z.z hop),
times out?!?!?! I assume it's because having load-sharing working
on one end and not on the other is causing this,(if that makes sense)?

Hmmm...I am not aware of any configuration that will not work with CEF.
Usually CEF is a requirement to get a lot of features to work.
Maybe you could provide a config so we can look at this closer?

By the way since per-destination load-sharing is the default, why not
configure four /25 static routes instead of two /24s? That might give the
desired effect...


"Captain" <> wrote in message
news:...
> On Sat, 11 Sep 2004 02:06:42 +0200, "M.C. van den Bovenkamp"
> <> wrote:
>
> >Captain wrote:
> >
> >> I'm trying to load share on a Cisco3640.
> >>
> >> I tried the following, but all the packets
> >> want to use the z.z.z.z connection only.
> >>
> >> !!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!! !!!!!!!!!!!
> >> !
> >> ip route x.x.x.0 255.255.255.0 z.z.z.z
> >> ip route x.x.x.0 255.255.255.0 y.y.y.y
> >> !
> >> !!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!! !!!!!!!!!!!
> >>
> >> Is there not an easy way of telling the
> >> packets to use BOTH gateways?
> >
> >It should do so by default, unless all your packets have the *exact*
> >same destination. IOS does per-destination loadsharing by default when
> >fast switching is enabled, so all packets for the same host will always
> >take the same path.
> >
> ==================================================
>
> Yes, the exact same destination.
>
> ==================================================
> >
> >Two ways around this:
> >
> >Disable fast switching ('no ip route-cache'). And watch your router go
> >into meltdown if you have serious traffic...
> >
> ==================================================
>
> I'm not sure what "serious traffic" is, but I would say YES, this
> production router has a LOT of traffic on it!!
>
> ==================================================
> >
> >Run CEF ('ip cef') and run with 'ip load-sharing per-packet'.
> >
> ==================================================
>
> Do to the other configuration on this router,(which I'm trying not
> to mess up), I can't seem to get 'ip load-sharing per-packet' to
> do anything?
>
> ==================================================
> >
> >But the answer might be simpler than that. is the y.y.y.y route *in the
> >routing table*? I.e. does it show up in 'show ip route'? Perhaps y.y.y.y
> >isn't reachable for some reason, and the z.z.z.z route is the only one
> >that actually works.
> >
> ==================================================
>
> Yes, both the yyyy and zzzz are there,(and working fine when
> left on their own)....
>
> ==================================================
> >
> > Regards,
> >
> > Marco.
>