Vieri
l33t
Joined: 18 Dec 2005
Posts: 887
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 Posted: Wed Sep 29, 2021 1:15 pm Post subject: Gentoo Linux bonding modes |
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Hi,
I'm using 3 NICs in balance-alb bonding mode.
It has been working fine for years, but now I'm about to change the stacked root switch where the Gentoo firewall is connected and I'd like to make sure I don't run into trouble.
From the bonding README file I can read:
| Quote: | When a link is reconnected or a new slave joins the
bond the receive traffic is redistributed among all
active slaves in the bond by initiating ARP Replies
with the selected MAC address to each of the
clients. The updelay parameter (detailed below) must
be set to a value equal or greater than the switch's
forwarding delay so that the ARP Replies sent to the
peers will not be blocked by the switch.
updelay
Specifies the time, in milliseconds, to wait before enabling a
slave after a link recovery has been detected. This option is
only valid for the miimon link monitor. The updelay value
should be a multiple of the miimon value; if not, it will be
rounded down to the nearest multiple. The default value is 0.
miimon
Specifies the MII link monitoring frequency in milliseconds.
This determines how often the link state of each slave is
inspected for link failures. A value of zero disables MII
link monitoring. A value of 100 is a good starting point.
The use_carrier option, below, affects how the link state is
determined. See the High Availability section for additional
information. The default value is 0.
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Now, I configure my network with Gentoo's /etc/conf.d/net file (sys-apps/openrc-0.42.1) with something like this:
| Code: | config_lanixa="null"
config_lanma="null"
config_lanmb="null"
slaves_lan="lanixa lanma lanmb"
mode_lan="balance-alb" |
The only parameters I set are the bonding mode and the slave interfaces.
The rest is set by the package, and here are a few values:
| Code: | # cat /sys/class/net/lan/bonding/active_slave
lanma
# cat /sys/class/net/lan/bonding/arp_interval
0
# cat /sys/class/net/lan/bonding/downdelay
0
# cat /sys/class/net/lan/bonding/mii_status
up
# cat /sys/class/net/lan/bonding/miimon
100
# cat /sys/class/net/lan/bonding/mode
balance-alb 6
# cat /sys/class/net/lan/bonding/peer_notif_delay
0
# cat /sys/class/net/lan/bonding/slaves
lanixa lanma lanmb
# cat /sys/class/net/lan/bonding/updelay
0
# cat /sys/class/net/lan/bonding/use_carrier
1 |
What worries me is the README saying "The updelay value should be a multiple of the miimon value".
It also says "The updelay parameter must be set to a value equal or greater than the switch's forwarding delay".
I'm not sure how I can set/verify that value.
Is it the same as what's known as a "bridge forward delay" in a D-Link switch?
Is it safe to leave updelay as 0 (default)?
Regards,
Vieri |
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