Changing a TDF Interface

date_range 13-Jan-21

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This procedure describes how to use maintenance mode to halt new sessions from being started and to verify that no active sessions remain before making changes to a TDF interface address.

From configuration mode, activate maintenance mode for a gateway.

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[edit]
user@host# set unified-edge gateways tdf gateway-name service-mode maintenance 
user@host# commit

Verify that the TDF gateway is in maintenance mode.
```
[edit]
user@host# run show unified-edge tdf gateway service-mode
```
From the gateway hierarchy, the service mode for the TDF gateway shows Maintenance – Active Phase if all the sessions using this pool are cleared. The service mode for the gateway shows Maintenance – In Phase if some sessions are actively using this pool.
Verify that no subscribers are active on this gateway.
```
[edit]
user@host# run show unified-edge tdf subscribers gateway gateway-name
```
Note:
If a large number of subscribers use this gateway, the preceding command can be process intensive, in which case you can use the following command to show the active contexts across all of the gateway instances:

[edit] user@host# run show unified-edge tdf status
(Optional) Terminate sessions that are using the gateway using the following clear command:
```
[edit]
user@host# run clear  unified-edge tdf subscribers gateway  gateway-name
```
CAUTION:
This clear command deletes all of the existing subscribers on the gateway. Only issue these commands if you intend to disconnect service to all these subscribers.
When the subscriber count is zero, and all sessions have ended, modify the TDF interface in active maintenance mode.
```
[edit]
user@host# set unified-edge gateways tdf gateway-name domains domain-name 
user@host# commit
```
Note:
These modifications must be made in active maintenance mode or they fail.

Verify that changes were properly committed.

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user@host# run show configuration unified-edge tdf gateway  gateway-name

Exit maintenance mode and commit the changes.

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user@host# delete unified-edge gateways tdf gateway-name gateway gateway-name service-mode  
user@host# commit

Return the gateway to operational state.

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[edit]
user@host# run show unified-edge tdf gateway service-mode 

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