| Exam 642-883 | Question id=3435 | IS-IS, IPv4, and IPv6 in Service Provider Environments |
The Cisco IOS XE Software summary-address router IS-IS configuration command can be used to send a summarized route into which IS-IS hierarchy?
| A. |
Level 1 only | |
| B. |
Level 2 only | |
| C. |
Level-1-2 only | |
| D. |
Level 1 or Level 2 or Level-1-2 |
To create aggregate addresses for IS-IS, use the summary-address command in router configuration mode.
To restore the default, use the no form of this command.
summary-address address mask {level-1|level-1-2|level-2}
no summary-address address mask {level-1|level-1-2|level-2}
Syntax Description:
address - Summary address designated for a range of addresses.
mask - IP subnet mask used forthe summary route.
level-1 - Only routes redistributed into Level 1 are summarized with the configured address and mask value.
level-1-2 - Summary routes are applied when redistributing routes into Level 1 and Level 2 IS-IS, and when Level 2 IS-IS advertises Level 1 routes as reachable in its area.
level-2 - Routes learned by Level 1 routing are summarized into the Level 2 backbone with the configured address and mask value. Redistributed routes into Level 2 IS-IS will be summarized also.