[j-nsp] exception traffic types for Juniper routers

[Martin T]

David,

thanks for the "show pfe statistics exceptions" command! It seems to
be supported only on newer MX series routers(?). According to this
command packets with for example "ttl expired", "IP options", "tunnel
hdr needs reassembly", "IGMP snooping control packet", "PIM snooping
control packet", "MLD snooping control packet", "Tunnel keepalives"
etc are punted. What about ICMP traffic? How much does it depend on
platform which traffic is punted and which traffic is not?


Akash,

could you please show an example?


Brandon,

of course, sorry! So ASIC(probably platform dependent, but at least in
the past it was called "I/O manager ASIC") on PFE will look into
IP/IPv6 header and if destination IP/IPv6 address is configured to
router, then the packet is sent to RE. What about traffic destioned to
router which does not have IP/IPv6 header? IS-IS traffic should be one
example.


regards,
Martin

On Tue, Sep 29, 2015 at 11:57 PM, Brandon Ross <bross at pobox.com> wrote:
> On Tue, 29 Sep 2015, Martin T wrote:
>
>> as I understand, there are several different exception traffic types:
>>
>> 1) unicast traffic addressed to router itselt. For example telnet, SSH
>> or SNMP traffic. I guess it is technically correct to say that
>> "incoming frames which have one of the router interfaces MAC addresses
>> as a destination MAC address are exception traffic"?
>
>
> I certainly hope not, that would mean that every packet routed by the router
> would be punted to the processor.
>
> It would have to have an IP address that matches one of the addresses
> assigned the the router, not the MAC.
>
> --
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