[Xorp-users] subnet routes & xorp

[Ben Greear]

Pavlin Radoslavov wrote:
> Ben Greear <greearb at candelatech.com> wrote:
> 
>> Does xorp do the equivalent of 'ifconfig down ethx; ifconfig up ethx' when
>> you add and/or delete an interface & vif?
>>
>> A subnet route is disappearing from and interface that I removed
>> from one xorp instance and added to another, and if it's bouncing the
>> interface, that could explain why...
> 
> The "down/up" operations should happen only in certain situations
> when are really needed. E.g., setting the MTU or the MAC address are
> two examples that come to mind: the interface must be in DOWN state
> otherwise the setting will fail.
> 
> The Linux "ip monitor" in a separate xterm will tell you whether the
> "down/up" operations actually happen in your case.

It looks like Xorp is removing it, but I could be wrong.

I'm not changing MAC or MTU.

My comments inline with # prefix

# Start of my script's commands
Deleted 10:     from all to 10.0.0.2 iif rddVR44 lookup local
Deleted 10:     from all to 10.4.0.7 iif rddVR44 lookup local
Deleted 10:     from all to 10.4.0.7 iif rddVR1 lookup local
Deleted 20:     from all iif rddVR44 lookup 10001
Deleted 30:     from 10.4.0.7 lookup 10001
10:     from all to 10.4.0.7 iif rddVR44 lookup local
10:     from all to 10.0.0.1 iif rddVR44 lookup local
10:     from all to 10.2.0.1 iif rddVR44 lookup local
10:     from all to 10.3.0.1 iif rddVR44 lookup local
10:     from all to 10.4.0.7 iif rddVR0 lookup local
10:     from all to 10.4.0.7 iif rddVR3 lookup local
10:     from all to 10.4.0.7 iif br2 lookup local
20:     from all iif rddVR44 lookup 10002
30:     from 10.4.0.7 lookup 10002
10.4.0.0/24 via 10.4.0.7 dev rddVR44  table 10002

# my script should be done at this point and now calling into
# xorpsh  Looks like the routes go away here, maybe because
# Xorp is removing the IP address when I delete the interface
# through xorpsh?

Deleted 71: rddVR44    inet 10.4.0.7/24 brd 10.4.0.255 scope global rddVR44
Deleted 10.4.0.0/24 dev rddVR44  proto kernel  scope link  src 10.4.0.7
Deleted broadcast 10.4.0.255 dev rddVR44  table local  proto kernel  scope link  src 10.4.0.7
Deleted broadcast 10.4.0.0 dev rddVR44  table local  proto kernel  scope link  src 10.4.0.7
Deleted local 10.4.0.7 dev rddVR44  table local  proto kernel  scope host  src 10.4.0.7

# Specifically, here's the ones in my special routing table
Deleted 10.1.0.0/24 via 10.0.0.2 dev rddVR0  table 10002  proto xorp  metric 3 notify
Deleted 10.4.0.0/24 via 10.0.0.2 dev rddVR0  table 10002  proto xorp  metric 2 notify

# Now it seems Xorp is re-adding them, but it doesn't know how to deal with
# my special table, so in the end, my routes are not quite right...

71: rddVR44    inet 10.4.0.7/24 brd 10.4.0.255 scope global rddVR44
local 10.4.0.7 dev rddVR44  table local  proto kernel  scope host  src 10.4.0.7
broadcast 10.4.0.255 dev rddVR44  table local  proto kernel  scope link  src 10.4.0.7
10.4.0.0/24 dev rddVR44  proto kernel  scope link  src 10.4.0.7
broadcast 10.4.0.0 dev rddVR44  table local  proto kernel  scope link  src 10.4.0.7


Thanks,
Ben


-- 
Ben Greear <greearb at candelatech.com>
Candela Technologies Inc  http://www.candelatech.com