Internal VLANs are allocated for L3 interfaces etc. The default allocation range is between VLAN 1006 and VLAN 4094. Internal VLANS are assigned in either ascending (default) or descending order starting with the lowest number for ascending order and dynamic VLANS ( EVPN / VRF's ) are assigned from the other end of the range.
## default d1#show vlan internal allocation policy Internal VLAN Allocation Policy: ascending Internal VLAN Allocation Range: 1006-4094 ## Specify range d1#show running-config section internal vlan internal order ascending range 3006 3999 d1#show vlan internal allocation policy Internal VLAN Allocation Policy: ascending Internal VLAN Allocation Range: 3006-3999 d1#show vlan internal usage 3006 Ethernet49/1 3007 Ethernet50/1 # Specify dynamic range as well d1(config)#vlan dynamic range 3900-3999 d1(config)#show vlan dynamic Dynamic VLAN source VLANS dot1x NONE dynvtep NONE evpn 3997-3999 |
The default settings might cause vlan collision if a internal vlan is in use already
d1(config)#show vlan internal usage 3006 Ethernet49/1 3007 Ethernet50/1 d1(config)#vlan 3006 % VLAN 3006 is in use as an internal VLAN. Cannot create it. |
Dynamic vlans will just move dynamically as is seems
d1(config)#show vlan dynamic Dynamic VLAN source VLANS dot1x NONE dynvtep NONE evpn 3997-3999 d1(config)#vlan 3997 d1(config-vlan-3997)#name test d1(config-vlan-3997)#end d1#show vlan dynamic Dynamic VLAN source VLANS dot1x NONE dynvtep NONE evpn 3996,3998-3999 |
Do not set a dynamic vlan range outside of internal range. Things does not really work as intended
d1(config)#vlan dynamic range 4000 - 4094
d1(config)#show vlan dynamic
Dynamic VLAN source VLANS
dot1x NONE
dynvtep NONE
evpn NONE <-- Something went wrong
d1(config)#show ip route vrf MGMT
VRF: MGMT
..
Gateway of last resort:
C 10.42.0.0/24 is directly connected, Vlan700
C 10.101.2.2/32 is directly connected, Loopback1
C 10.101.3.0/24 is directly connected, Vlan30
B E 10.101.4.6/32 [200/0] via
via
B E 10.101.4.0/24 [200/0] via
via
S 10.101.100.0/24 [1/0] via 192.168.2.25, Vlan99
C 192.168.0.0/24 is directly connected, Vlan1
C 192.168.2.0/24 is directly connected, Vlan99
S 192.168.222.0/24 [1/0] via 192.168.2.25, Vlan99
d1(config)#no vlan dynamic range
d1(config)#show vlan dynamic
Dynamic VLAN source VLANS
dot1x NONE
dynvtep NONE
evpn 3993-3995
d1(config)#show ip route vrf MGMT
VRF: MGMT
..
Gateway of last resort:
B E 0.0.0.0/0 [200/0] via VTEP 10.101.0.4 VNI 100001 router-mac fc:bd:67:e3:5e:dd
C 10.42.0.0/24 is directly connected, Vlan700
B E 10.101.2.0/32 [200/0] via VTEP 10.101.0.0 VNI 100001 router-mac fc:bd:67:d0:e6:bd
B E 10.101.2.1/32 [200/0] via VTEP 10.101.0.1 VNI 100001 router-mac fc:bd:67:d0:fb:5d
C 10.101.2.2/32 is directly connected, Loopback1
B E 10.101.2.3/32 [200/0] via VTEP 10.101.0.3 VNI 100001 router-mac fc:bd:67:b7:68:c9
B E 10.101.2.4/32 [200/0] via VTEP 10.101.0.4 VNI 100001 router-mac fc:bd:67:e3:5e:dd
B E 10.101.2.5/32 [200/0] via VTEP 10.101.0.5 VNI 100001 router-mac fc:bd:67:e3:4b:f7
C 10.101.3.0/24 is directly connected, Vlan30
B E 10.101.4.6/32 [200/0] via VTEP 10.101.0.5 VNI 100001 router-mac fc:bd:67:e3:4b:f7
via VTEP 10.101.0.4 VNI 100001 router-mac fc:bd:67:e3:5e:dd
B E 10.101.4.0/24 [200/0] via VTEP 10.101.0.5 VNI 100001 router-mac fc:bd:67:e3:4b:f7
via VTEP 10.101.0.4 VNI 100001 router-mac fc:bd:67:e3:5e:dd
S 10.101.100.0/24 [1/0] via 192.168.2.25, Vlan99
B E 10.103.0.0/31 [200/0] via VTEP 10.101.0.4 VNI 100001 router-mac fc:bd:67:e3:5e:dd
B E 172.30.89.1/32 [200/0] via VTEP 10.101.0.4 VNI 100001 router-mac fc:bd:67:e3:5e:dd
C 192.168.0.0/24 is directly connected, Vlan1
B E 192.168.1.0/24 [200/0] via VTEP 10.101.0.0 VNI 100001 router-mac fc:bd:67:d0:e6:bd
C 192.168.2.0/24 is directly connected, Vlan99
S 192.168.222.0/24 [1/0] via 192.168.2.25, Vlan99
B E 193.10.255.104/32 [200/0] via VTEP 10.101.0.4 VNI 100001 router-mac fc:bd:67:e3:5e:dd
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