I am facing issues with my 7613 router after creating VRF's.Configuration follows :
ip vrf A
route-target both 1:1
encapsulation dot1q 100
ip vrf forwarding A
ip address x.x.x.x y.y.y.y
router bgp <as>
address-family ipv4 vrf A
Once I write memory after doing all this, the router allocated a VLAN between 1006-4094 for internal uses. Does anyone have a clear explanation as to why this internal allocation is done when I already allocated VLAN 100 for my sub-interface???
In case of SVIs, no allocation is done...
The internal allocation of VLANs for Layer 3 interfaces is in the VLAN configuration guide.
It has to do with the architecture of the box. Pretty much everything in the 7600 is based off VLANs. Each Layer 3 interface (including SVIs internal allocation equals SVI#)is assigned a VLAN internally. The internal association of a Layer 3 interface is based off a VLAN value. You can't stop that. You can change where it starts allocating VLANs at in the extended range, either by starting at 1006 and going up (default) or starting at 4094 and going down.