Failure of dhcp server failover
Eugene Grosbein
eugen at grosbein.net
Mon May 2 17:43:47 UTC 2016
02.05.2016 2:37, Niall O'Reilly пишет:
> On 1 May 2016, at 19:41, Eugene Grosbein wrote:
>
>> Thank you, this is interesting. But in my case all requests from single AP came with the same gwaddr,
>
> Ah. Whenever I have configured Cisco router, I have been able to configure the relay function
> per-VLAN rather than per port. If that’s a possibility for you, it may be interesting. From
> what you say, router isn’t currently separating the VLANs.
My Cicso router is separating VLANs and relay works per-VLAN. These are just "ip unnumbered" vlans:
interface Loopback2
description "DHCP default gateway"
ip address 31.220.160.2 255.255.255.255
no ip redirects
!
interface Vlan1000
description "DHCP Guest"
ip unnumbered Loopback2
ip helper-address X.X.X.X
ip helper-address Y.Y.Y.Y
ip verify unicast source reachable-via rx
!
interface Vlan2000
description "DHCP Guest"
ip unnumbered Loopback2
ip helper-address X.X.X.X
ip helper-address Y.Y.Y.Y
ip verify unicast source reachable-via rx
!
The routers also runs DHCP snooping, it sees as DHCP server assigns IP addresses
and installs corresponding /32 route to corresponding network interface and
removes such route later when lease expires. These are standard functions
of Cisco DHCP relaying/snooping.
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