[c-nsp] ASR9000 LC CPU Punt

[John Neiberger]

As I understand it, LPTS handles any locally destined traffic, which would
include the following (according to the book IOS XR Fundamentals):


* All IPv4, IPv6, and MPLS traffic related to routing protocols, or control
plane such as MPLS LDP or RSVP. The control plane computations for
protocols are done on the Router Processor (RP) of the router. Therefore,
whenever routing or MPLS control plane traffic is received on a line card
interface, it needs to be delivered to the RP of the router.
* MPLS packets with the Router Alert label
* IPv4, IPv6, or MPLS packets with a TTL less than 2
* IPv4 or IPv6 packets with options
* IP packets requiring fragmentation or reassembly
* Layer 2 keepalives
* Address Resolution Protocol (ARP) packets
* ICMP message generation and response




On Tue, Aug 6, 2013 at 3:57 PM, Kasper Adel <karim.adel at gmail.com> wrote:

> Doesnt lpts handle for-us packets only?
>
> Whats the command to see punted traffic?
>
> Kim
>
>
> On Tuesday, August 6, 2013, John Neiberger wrote:
>
>> Check the LPTS counters. LPTS (Local Packet Transport Service) is
>> essentially control plane policing. Here's a page that talks about it.
>> Most
>> of the commands are not very user friendly, but it seems to be fairly
>> powerful.
>>
>> https://supportforums.cisco.com/docs/DOC-23032
>>
>> I thing the command you'll need will be some variation of "show lpts pifib
>> hardware entry location <location>", but I'm not at a router right now to
>> play around with it.
>>
>> HTH,
>> John
>>
>>
>> On Mon, Aug 5, 2013 at 6:14 PM, Sami Joseph <sami.joseph at gmail.com>
>> wrote:
>>
>> > Hello,
>> >
>> > How do i check if the LC CPU is getting packets punted to it ?
>> >
>> > Thanks,
>> > Sam
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>