OTV FAQs

1.Can OTV VDC configured with SVI of the Extended VLAN?

Answer:-No, OTV VDC cannot have SVI of the extended Vlans.

2.Is OTV supported on all series of line cards?

Answer:- No, OTV is not supported on F1,F2,F2e. It is only supported on M series and F3 line cards.

3.Does OTV advertise the mac-address?

Answer: - Unlike fabricpath, OTV advertise the mac-address.

4.What is the size of OTV header?

Answer: 42 Bytes

5.How the authoritative edge device role is negotiated?

Answer:- Edge device with lower system-id will become authoritative for all even extended vlans and edge devices with higher system-id will be elected for all odd vlans.

6.What is the COS and DSCP value of OTV control packet?

Answer:- COS=6/DSCP=48

7.Can multiple overlay interfaces share the same join interface?

Answer:- Yes, One join interface can be shared between multiple overlay interfaces.

8.How many overlay interfaces can be configured on the edge devices?

Answer:- Maximum 10 overlay interfaces can be configured.

9.How many sites can be paired on OTV?

Answer:- Maximum 6 sites can be configured.

10.   How many edge device per site can exist?

Answer:- Maximum two edge devices can be configured per site.

11. How many vlans can be extended via OTV?

Answer:- Maximum 256 Vlans can be extended.

12.What license is required for OTV?

Answer:- Transport  service license.

13.   Can we configure loopback interface as join interface?

 Answer:- NO, only physical interface, sub-interface,port-channel and port-channel sub interface can be configured as join interface.

SVI and loopback cannot be configured as join interface.

15.Can we configure 1 Gig port as join interface?

Answer:- Yes, there is no restriction for 10 gig.

16. Is OTV support fragmentation?

Answer:- No in OTV fragmentation or reassembly is not supported. All control and data traffic is sent with DF bit sent. OTV adds 42 byte header to IP packet.

17.Is STP BPDU sent across OTV link by default?

Answer: - No, STP BPDU are blocked by default.

18.Is unknown unicast is sent across OTV link?

Answer:- No, it is also not permitted to cross OTV link. OTV assume that there is no silent machine in the environment.