>
> TG> Is there a reason the cache is not invalidated before calling
> TG> _cache_load()?
>
> Yes.. the old entries are needed to
>
> a) implement 64 bit counters (esp on 32 bit systems)
> b) notice when interfaces appear and disappear
>
> If you look at the code, it wouldn't be too to add code to remove interfaces
> that go down, bit it should be configurable and default to off. People who
> have vlans that periodically go up and down should have the option of keeping
> the running counters.
Currently, the code displays the interfaces regardless of the interface
status (up/down).
For example:
Notice that eth0, eth1 or eth0.100 are in DOWN state here, but still are
displayed by snmpwalk.
root:~# ip link show
1: eth0: <NO-CARRIER,BROADCAST,MULTICAST,UP> mtu 1500 qdisc
pfifo_fast vrf global qlen 1000
link/ether 00:15:17:20:d9:ad brd ff:ff:ff:ff:ff:ff
2: eth1: <BROADCAST,MULTICAST> mtu 1500 qdisc pfifo_fast vrf
global qlen 1000
link/ether 00:04:23:bd:7a:8a brd ff:ff:ff:ff:ff:ff
3: lo: <LOOPBACK,UP,10000> mtu 16436 qdisc noqueue vrf global
link/loopback 00:00:00:00:00:00 brd 00:00:00:00:00:00
38: eth0....@eth0: <BROADCAST,MULTICAST> mtu 1500 qdisc noop vrf
global
link/ether 00:15:17:20:d9:ad brd ff:ff:ff:ff:ff:ff
root:~# snmpwalk localhost ifName
IF-MIB::ifName.1 = STRING: eth0
IF-MIB::ifName.2 = STRING: eth1
IF-MIB::ifName.3 = STRING: lo
IF-MIB::ifName.38 = STRING: eth0.100
I remove the eth0.100 interface here:
root:~# vconfig rem eth0.100
Removed VLAN -:eth0.100:-
The interface list looks like:
root:~# ip link show
1: eth0: <NO-CARRIER,BROADCAST,MULTICAST,UP> mtu 1500 qdisc
pfifo_fast vrf global qlen 1000
link/ether 00:15:17:20:d9:ad brd ff:ff:ff:ff:ff:ff
2: eth1: <BROADCAST,MULTICAST> mtu 1500 qdisc pfifo_fast vrf
global qlen 1000
link/ether 00:04:23:bd:7a:8a brd ff:ff:ff:ff:ff:ff
3: lo: <LOOPBACK,UP,10000> mtu 16436 qdisc noqueue vrf global
link/loopback 00:00:00:00:00:00 brd 00:00:00:00:00:00
snmpwalk still shows the interface eth0.100:
root:~# snmpwalk localhost ifName
IF-MIB::ifName.1 = STRING: eth0
IF-MIB::ifName.2 = STRING: eth1
IF-MIB::ifName.3 = STRING: lo
IF-MIB::ifName.38 = STRING: eth0.100 <-----
I notice the 'known_missing' flag, that seems to be set for the VLAN
interface that is removed. This flag is not _used_ anywhere in the
code. A possibility is not report the interface entry when this flag is
set, when responding to GET requests.
Suggestions/critique appreciated.
Many thanks,
- Tushar
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