[P4-dev] simple router example - adding entries to the source_mac_rewrite table

Antonin Bas antonin at barefootnetworks.com
Tue Apr 28 14:48:04 EDT 2015


Hi Salvatore,

I fixed it. Thanks again for pointing it out.

Antonin

On Tue, Apr 28, 2015 at 12:03 AM, Salvatore Signorello <
salvatore.signorello at uni.lu> wrote:

> Hi Antonin,
>
> thanks for the prompt feedback, my answers in line
>
> Best,
> Salvatore
> On Mon, 2015-04-27 at 14:30 -0700, Antonin Bas wrote:
> > Hi Salvatore,
> >
> >
> > You are correct. The second command should be:
> > python ../../cli/pd_cli.py -p simple_router -i pd_thrift.simple_router
> > -s $PWD/of-tests:$PWD/../../submodules/oft-infra -m "add_entry
> > send_frame 2 rewrite_mac 00:aa:bb:00:00:01" -c localhost:22222
> >
> >
> > This means that the source mac address is wrong on some of the packets
> > forwarded by the router. This does not prevent the demo from working,
> > even though some packets are not correct. I expect the end host (h2)
> > doesn't really care about this wrong address. Note that the simple
> > router does not support ARP packets and that the switch mac addresses
> > are added to the hosts' ARP cache by the mininet script.
> Yeap, I'd already checked ARP caches on both node and they were ok, but
> because, as you said, those are statically filled by the 1sw_demo.py
> >
> >
> > Do you want me to fix the bug you found, or do you want to submit a
> > pull request on p4lang?
> Please go ahead and fix it, I think this is more a typo than a bug ;)
> >
> >
> > Thanks,
> >
> >
> > Antonin
> >
> >
> > On Mon, Apr 27, 2015 at 2:07 PM, Salvatore Signorello
> > <salvatore.signorello at uni.lu> wrote:
> >         Hi all,
> >
> >         I've run smoothly the Mininet integration demo for the target
> >         "simple router" provided with the p4factory software-bundle,
> >         but I need some help to understand the run_add_demo_entries.sh
> >         script's content. Especially I care about the first two lines
> >         used to fill the "send_frame" table:
> >
> >         python ../../cli/pd_cli.py -p simple_router -i
> >         pd_thrift.simple_router -s $PWD/of-tests:
> >         $PWD/../../submodules/oft-infra -m "add_entry send_frame 1
> >         rewrite_mac 00:aa:bb:00:00:00" -c localhost:22222
> >         python ../../cli/pd_cli.py -p simple_router -i
> >         pd_thrift.simple_router -s $PWD/of-tests:
> >         $PWD/../../submodules/oft-infra -m "add_entry send_frame 1
> >         rewrite_mac 00:aa:bb:00:00:01" -c localhost:22222
> >
> >         where the add_entry command seems to fill twice the same entry
> >         but with two different MAC addresses. As regards the
> >         "add_entry", I'm referring to the syntax found into the
> >         p4factory/cli/pd_cli.py that follows:
> >
> >         <<
> >         def do_add_entry(self, line):
> >             """
> >             add_entry TABLE_NAME MATCH_FIELDS... ACTION_NAME
> >         ACTION_PARAMETERS...
> >             Adds an entry with the specified MATCH_FIELDS, ACTION_NAME
> >         and
> >             ACTION_PARAMETERS to TABLE_NAME. Prints the entry handle
> >         of the newly added
> >             entry.
> >             """
> >         >>
> >
> >         Should not the egress port be different for those entries? How
> >         does it work the rewriting using the so-defined entries?
> >
> >         Thank you in advance for any hint,
> >         Best,
> >         Salvatore
> >
> >         _______________________________________________
> >         P4-dev mailing list
> >         P4-dev at p4.org
> >         http://p4.org/mailman/listinfo/p4-dev_p4.org
> >
> >
> >
> >
> > --
> > Antonin
> >
>
>
>


-- 
Antonin
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