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Date:   Thu, 26 Jul 2018 00:35:01 +0000
From:   "D'Souza, Nelson" <>
To:     David Ahern <>,
        "" <>
Subject: Re: [**EXTERNAL**] Re: VRF with enslaved L3 enabled bridge


I tried out the commands on an Ubuntu 17.10.1 VM.
The pings on test-vrf are successful, but the pings on br0 are not successful.

# uname -rv  
4.13.0-21-generic #24-Ubuntu SMP Mon Dec 18 17:29:16 UTC 2017

 # lsb_release -a
No LSB modules are available.
Distributor ID:	Ubuntu
Description:	Ubuntu 17.10    
Release:	17.10
Codename:	artful

# ip rule  --> Note: its missing the l3mdev rule
0:	from all lookup local 
32766:	from all lookup main 
32767:	from all lookup default

Ran the configs from a bash script

 # ./ 
+ ip netns add foo
+ ip li add veth1 type veth peer name veth2
+ ip li set veth2 netns foo
+ ip -netns foo li set lo up
+ ip -netns foo li set veth2 up
+ ip -netns foo addr add dev veth2
+ ip li add test-vrf type vrf table 123
+ ip li set test-vrf up
+ ip ro add vrf test-vrf unreachable default
+ ip li add br0 type bridge
+ ip li set veth1 master br0
+ ip li set veth1 up
+ ip li set br0 up
+ ip addr add dev br0
+ ip li set br0 master test-vrf
+ ip -netns foo addr add dev lo
+ ip ro add vrf test-vrf via

# ping -I test-vrf -c 2  <<< successful on test-vrf
ping: Warning: source address might be selected on device other than test-vrf.
PING ( from test-vrf: 56(84) bytes of data.
64 bytes from icmp_seq=1 ttl=64 time=0.035 ms
64 bytes from icmp_seq=2 ttl=64 time=0.045 ms

--- ping statistics ---
2 packets transmitted, 2 received, 0% packet loss, time 1022ms
rtt min/avg/max/mdev = 0.035/0.040/0.045/0.005 ms

#ping -I br0 -c 2   <<< fails on br0
PING ( from br0: 56(84) bytes of data.

--- ping statistics ---
2 packets transmitted, 0 received, 100% packet loss, time 1022ms

Please let me know if I should try a different version.


On 7/24/18, 9:08 AM, "D'Souza, Nelson" <> wrote:

    It's strange that enslaving eth1 -> br0 -> test-vrf does not work, but enslaving eth1->test-vrf works fine.
    On 7/24/18, 8:58 AM, "D'Souza, Nelson" <> wrote:
        Thank you David, really appreciate the help. Most likely something specific to my environment.
        ip vrf id, does not report anything on my system. Here's the result after running the command.
        # ip vrf id
        I'll follow up with a VM.
        On 7/24/18, 5:55 AM, "David Ahern" <> wrote:
            On 7/23/18 7:43 PM, D'Souza, Nelson wrote:
            > I copy and pasted the configs onto my device, but pings on test-vrf do not work in my setup. 
            > I'm essentially seeing the same issue as I reported before.
            > In this case, pings sent out on test-vrf (host ns) are received and replied to by the loopback interface (foo ns). Although the replies are seen at the test-vrf level, they are not locally delivered to the ping application.
            I just built v4.14.52 kernel and ran those commands - worked fine. It is
            something specific to your environment. Is your shell tied to a VRF --
            (ip vrf id)?
            After that, I suggest you create a VM running a newer distribution of
            your choice (Ubuntu 17.10 or newer, debian stretch with 4.14 kernel, or
            Fedora 26 or newer) and run the commands there.

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