I have outdated AIR-BR1310 with broken configuration. This is not about fixing it, but mostly about understanding why it works like it works.
BR1310 is connected via trunk interface. Native VLAN have nothing, VLAN 26 is for wireless and VLAN 20 is for management. Configuration will follow.
After some experiments I had learned the following:
1. There is no routing (even default gateway) if BVI1 have no IP address.
2. There is no way to have routing on other BVI interface.
3. IP works if FastEthernet0.20 have IP address (but without routing).
4. There is no way to remove bridge-group1 from FastEthernet0, so there is no way to disconnect native VLAN with BVI1.
I conclude that only native VLAN (which arrive to FastEthernet 0 and hard-attached to BVI1) can be the management one, so I can ping or tftp via router.
Is there a proper configuration to have management working over not-native VLAN?
interface Dot11Radio0 no ip address no ip route-cache ! encryption vlan 26 mode ciphers aes-ccm tkip
bridge-group 1 block-unknown-source no bridge-group 1 source-learning no bridge-group 1 unicast-flooding bridge-group 1 spanning-disabled
interface Dot11Radio0.26 encapsulation dot1Q 26 no ip route-cache no snmp trap link-status bridge-group 26
bridge-group 26 subscriber-loop-control bridge-group 26 block-unknown-source no bridge-group 26 source-learning no bridge-group 26 unicast-flooding bridge-group 26 spanning-disabled
interface FastEthernet0 no ip address no ip route-cache l2-filter bridge-group-acl bridge-group 1 no bridge-group 1 source-learning bridge-group 1 spanning-disabled
interface FastEthernet0.20 encapsulation dot1Q 20 ip address 172.20.20.21 255.255.255.0 no ip route-cache no snmp trap link-status bridge-group 20 no bridge-group 20 source-learning bridge-group 20 spanning-disabled
interface FastEthernet0.26 encapsulation dot1Q 26 no ip route-cache no snmp trap link-status bridge-group 26 no bridge-group 26 source-learning
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