Hi,
Wanted to share some results.
At version 1.4.2 we see solid uptime for BFD sessions.
This output collected at 15August:
bird> show bfd sessions
bfd1:
IP address Interface State Since Interval Timeout
193.232.245.134 bce1 Down 2014-06-09 11:17:23
1.000 0.000
193.232.244.207 bce1 Up 2014-06-09 11:17:24
1.000 5.000
193.232.245.54 bce1 Up 2014-06-09 11:17:24
1.000 5.000
193.232.244.80 bce1 Up 2014-06-13 15:24:28
1.000 5.000
193.232.245.198 bce1 Up 2014-06-23 10:37:03
1.000 5.000
193.232.244.88 bce1 Up 2014-07-30 14:33:23
1.000 5.000
193.232.245.184 bce1 Up 2014-06-09 11:17:24
1.000 5.000
193.232.245.133 bce1 Up 2014-06-17 16:02:02
1.000 5.000
bird>
This is sessions with real customers, real routers which pass traffic in
production environment controlled by different companies. This sessions
was established with our test box (no prefixes announced via BGP, no
reconfiguration changes).
Then we tried to migrate this BFD sessions to our production route
servers and faced with issues related to our network infrastructure. We
have two separate IP networks at the same VLAN. Each customer has 2
peering IP: from the first IP subnet, and from the second. One IP
assigned as primary, another as secondary at the same interface on
customer side.
Problem:
Routers of our customers able to communicate in terms of BFD only with
Route Server located in the same IP subnet with primary IP address on
their interface. With the Route Server in another IP subnet they can't
communicate in terms of BFD because SRC IP address for BFD packets is
wrong, equal to primary IP, not secondary.
This issue seen for Cisco, Juniper. Some platforms allow to redefine IP
address for BFD communication, but as far as we see, nobody could
communicate via BFD in both IP subnets at the same time.
Ondrej Zajicek wrote, 02.04.2014 22:32:
On Wed, Apr 02, 2014 at 05:19:06PM +0400, Mikhail A. Grishin wrote:
Ondrej Zajicek wrote, 01.04.2014 20:06:
On Wed, Mar 26, 2014 at 05:09:25PM +0400, Mikhail A. Grishin wrote:
1) How we can view via birdc the state of BFD-enabled peer in terms of
BFD state (up/down) ?
bird> show bfd sessions
bfd1:
IP address Interface State Since Interval Timeout
10.0.0.23 eth0 Up 2014-03-31 0.200 0.600
Please add "show bfd" to context menu:
Thanks, i missed that.
2) When BFD with some BGP peer is in Up state, how BFD-related
parameters for that peer can be viewed via birdc?
Examples for similar outputs from Cisco&Juniper - in attach.
Currently not available, but 'show bfd sessions' shows almost all
relevant info anyways.
OK, thanks. Any plans to improve?
Probably.
4) (Minor)
"bird> show protocols all bfd1" shows some Routes counters. Does that
make sense?
Well, no. Note that it also does not make sense for 'device' protocol,
but nobody ever complained about that. ;-)
kernel and direct protocols output doesn't show Routes counters :)
Yes if they are up:
bird> show protocols all
name proto table state since info
device1 Device master up 13:08:02
Preference: 240
Input filter: ACCEPT
Output filter: REJECT
Routes: 0 imported, 0 exported, 0 preferred
Route change stats: received rejected filtered ignored accepted
Import updates: 0 0 0 0 0
Import withdraws: 0 0 --- 0 0
Export updates: 0 0 0 --- 0
Export withdraws: 0 --- --- --- 0
direct1 Direct master up 13:08:02
Preference: 240
Input filter: ACCEPT
Output filter: REJECT
Routes: 5 imported, 0 exported, 5 preferred
Route change stats: received rejected filtered ignored accepted
Import updates: 5 0 0 0 5
Import withdraws: 0 0 --- 0 0
Export updates: 0 0 0 --- 0
Export withdraws: 0 --- --- --- 0
kernel1 Kernel master up 13:08:02
Preference: 10
Input filter: ACCEPT
Output filter: (unnamed)
Routes: 0 imported, 8 exported, 0 preferred
Route change stats: received rejected filtered ignored accepted
Import updates: 0 0 0 0 0
Import withdraws: 0 0 --- 0 0
Export updates: 20 10 0 --- 10
Export withdraws: 2 --- --- --- 2
bfd1 BFD master up 13:08:02
Preference: 0
Input filter: ACCEPT
Output filter: REJECT
Routes: 0 imported, 0 exported, 0 preferred
Route change stats: received rejected filtered ignored accepted
Import updates: 0 0 0 0 0
Import withdraws: 0 0 --- 0 0
Export updates: 0 0 0 --- 0
Export withdraws: 0 --- --- --- 0
--
Best regards,
Mikhail A. Grishin <m.gris...@msk-ix.ru>
