Configuring the ATT bit
A Level-1-2 router sends Level-1 LSPs with an ATT bit to inform the Level-1 routers that it can reach other areas.
Configuring IS-IS not to calculate the default route through the ATT bit
Step | Command | Remarks |
|---|---|---|
1. Enter system view. | system-view | N/A |
2. Enter IS-IS view. | isis [ process-id ] [ vpn-instance vpn-instance-name ] | N/A |
3. Configure IS-IS not to calculate the default route through the ATT bit. | ignore-att | By default, IS-IS uses the ATT bit to calculate the default route. |
Setting the ATT bit of Level-1 LSPs
Step | Command | Remarks |
|---|---|---|
1. Enter system view. | system-view | N/A |
2. Enter IS-IS view | isis [ process-id ] [ vpn-instance vpn-instance-name ] | N/A |
3. Set the ATT bit of Level-1 LSPs. | set-att { always | never } | By default, the ATT bit is not set for Level-1 LSPs. |