[c-nsp] MLPPP and ip load-sharing per-packet

[Rodney Dunn]

Oh what code is this?

We don't support MPLS over a MLPPP bundle on all codes. 

That's one of the SB deliverables.

http://www.cisco.com/en/US/products/sw/iosswrel/ps1839/products_feature_guide09186a00801e7ba7.html


On Mon, Oct 10, 2005 at 03:25:51PM -0400, Jon Lewis wrote:
> On Mon, 10 Oct 2005, Rodney Dunn wrote:
> 
> > Check 'sh cef in' for the bundle interface and see if it tells you anything.
> > You have to check the features on the downstream interfaces to see
> > if you have a feature on that will force a punt in that code.
> 
> Nothing real interesting.  Downstream interfaces (I assume you mean the 
> interfaces input traffic from the mu1 interface will be switched to) are 
> DS3s doing nothing special (tag-switching...but we do that all over the 
> network).
> 
> Multilink1 is up (if_number 77)
>    Corresponding hwidb fast_if_number 77
>    Corresponding hwidb firstsw->if_number 77
>    Internet address is 209.208.2.5/30
>    ICMP redirects are always sent
>    Per packet load-sharing is disabled
>    IP unicast RPF check is disabled
>    Inbound access list is not set
>    Outbound access list is not set
>    IP policy routing is disabled
>    BGP based policy accounting is disabled
>    Interface is marked as point to point interface
>    Hardware idb is Multilink1
>    Fast switching type 7, interface type 95
>    IP CEF switching enabled
>    IP CEF Flow Fast switching turbo vector
>    IP Null turbo vector
>    Input fast flags 0x0, Output fast flags 0x4000
>    ifindex 69(69)
>    Slot -1 Slot unit 1 VC -1
>    Transmit limit accumulator 0x0 (0x0)
>    IP MTU 1500
> 
> #sh int mu1 stat
> Multilink1
>            Switching path    Pkts In   Chars In   Pkts Out  Chars Out
>                 Processor    1587703  346958159       1136     126270
>               Route cache        515      50302    1852816  891831028
>                     Total    1588218  347008461    1853952  891957298
> 
> I realized I'd left tag-switching enabled on the member T1s.  I removed it 
> from them, so it's only on the mu1 interface.  Right after doing that, 
> there was a burst of route-cache processed input packets...but within a 
> few seconds, it was back to process switching all but the occasional 
> packet.
> 
> interface Multilink1
>   load-interval 30
>   tag-switching mtu 1520
>   tag-switching ip
>   service-policy output mu1out
>   no cdp enable
>   ppp authorization noauth
>   ppp multilink
>   no ppp multilink fragmentation
>   multilink-group 1
>   hold-queue 200 in
>   hold-queue 200 out
> 
> interface Serial5/0/1:0
>   bandwidth 1536
>   no ip address
>   encapsulation ppp
>   load-interval 30
>   no fair-queue
>   ppp authorization noauth
>   ppp multilink
>   multilink-group 1
> 
> 6 more Serial's configured identically.
> 
> I found that without the manually bumped up hold-queue's I had around 10% 
> packet loss.  I suspect they won't be necessary once the traffic is being 
> properly cef switched.
> 
> ----------------------------------------------------------------------
>   Jon Lewis                   |  I route
>   Senior Network Engineer     |  therefore you are
>   Atlantic Net                | 
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