netdev - Order of interfaces in output of ip link

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Date:	Tue, 02 Sep 2014 16:27:42 +0200
From:	Ovidiu Mara <ovidiu.mara@...l.ch>
To:	netdev@...r.kernel.org
Subject: Order of interfaces in output of ip link

Hi everyone,

The ip command shows the interfaces on this machine in an unnatural order (eth0 followed by eth2 then eth1).

For example:

ip -o link         
1: lo: <LOOPBACK,UP,LOWER_UP> mtu 65536 qdisc noqueue state UNKNOWN mode DEFAULT group default \    link/loopback 00:00:00:00:00:00 brd 00:00:00:00:00:00
2: eth0: <BROADCAST,MULTICAST,UP,LOWER_UP> mtu 1500 qdisc mq state UP mode DEFAULT group default qlen 1000\    link/ether 2c:59:e5:9a:4c:a4 brd ff:ff:ff:ff:ff:ff
3: eth2: <BROADCAST,MULTICAST,UP,LOWER_UP> mtu 1500 qdisc mq state UP mode DEFAULT group default qlen 1000\    link/ether ac:16:2d:98:9e:d8 brd ff:ff:ff:ff:ff:ff
4: eth1: <NO-CARRIER,BROADCAST,MULTICAST,UP> mtu 1500 qdisc mq state DOWN mode DEFAULT group default qlen 1000\    link/ether 2c:59:e5:9a:4c:a5 brd ff:ff:ff:ff:ff:ff
5: eth3: <BROADCAST,MULTICAST,UP,LOWER_UP> mtu 1500 qdisc mq state UP mode DEFAULT group default qlen 1000\    link/ether ac:16:2d:98:9e:d9 brd ff:ff:ff:ff:ff:ff
6: eth4: <BROADCAST,MULTICAST,UP,LOWER_UP> mtu 1500 qdisc mq state UP mode DEFAULT group default qlen 1000\    link/ether ac:16:2d:98:9e:da brd ff:ff:ff:ff:ff:ff
7: eth5: <BROADCAST,MULTICAST,UP,LOWER_UP> mtu 1500 qdisc mq state UP mode DEFAULT group default qlen 1000\    link/ether ac:16:2d:98:9e:db brd ff:ff:ff:ff:ff:ff
8: eth6: <BROADCAST,MULTICAST> mtu 1500 qdisc noop state DOWN mode DEFAULT group default qlen 1000\    link/ether a0:36:9f:26:b3:10 brd ff:ff:ff:ff:ff:ff
9: eth7: <BROADCAST,MULTICAST,UP,LOWER_UP> mtu 1500 qdisc mq state UP mode DEFAULT group default qlen 1000\    link/ether a0:36:9f:26:b3:12 brd ff:ff:ff:ff:ff:ff

eth0 and eth1 are two ports on the same network card, so I would expect them to be shown together, as they are numbered. According to the documentation I found here ( http://www.policyrouting.org/iproute2.doc.html#ss9.1.1 ): "The number followed by a colon is the interface index or ifindex. This number uniquely identifies the interface. If you look at the output from cat /proc/net/dev you will see that the network devices are listed in the same order as the numbering you see here."

However in /proc/net/dev they are shown in the natural order:

cat /proc/net/dev
Inter-|   Receive                                                |  Transmit
 face |bytes    packets errs drop fifo frame compressed multicast|bytes    packets errs drop fifo colls carrier compressed
  eth0: 1000705102 6535806    0 8946    0     0          0   2861813  5252988   39289    0    0    0     0       0          0
  eth1:       0       0    0    0    0     0          0         0        0       0    0    0    0     0       0          0
  eth2: 104506836  257406    0    0    0     0          0         0      648       8    0    0    0     0       0          0
  eth3: 104506430  257405    0    0    0     0          0         0      648       8    0    0    0     0       0          0
  eth4: 104506430  257405    0    0    0     0          0         0      648       8    0    0    0     0       0          0
  eth5: 104505618  257403    0    0    0     0          0         0      648       8    0    0    0     0       0          0
  eth6:       0       0    0    0    0     0          0         0        0       0    0    0    0     0       0          0
  eth7: 396628856508 364243051    0    0    0     0          0         0 398063721522 365214422    0    0    0     0       0          0
    lo:     178       2    0    0    0     0          0         0      178       2    0    0    0     0       0          0

I'm using iproute2-3.11.0.

Could you please tell me if there is any workaround for this?

Thanks,
Ovidiu

PS Please CC me in replies.
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