 | Copyright © 2008, Juniper Networks, Inc. All rights reserved. Trademark Notice. | |
E-series routers support the RFC 1213 interface numbering mode on bulkstats. This mode is contrasted with the default interface numbering mode.
The RFC 1213 numbering mode is based on a 32-bit contiguous integer value starting from 1 and ranging to ifNumber. This mode differs from the default interface numbering mode, which encodes a type field in the upper 8 bits of a 32-bit integer. The use of the upper 8 bits creates large gaps in the ifIndex numbering scheme.
There is no re-use of ifIndex values in RFC 1213 mode, whereas in the default interface numbering mode, ifIndex values can be re-used. In the default interface numbering mode, re-use of ifIndex values across reboots is permitted and is basically known as ifIndex re-numbering.
In RFC 1213 mode, however, the interface numbers are not re-used during a single initialization of the device and renumbering of ifIndexes occurs after a system reboot. In the default interface numbering mode, ifIndexes are persistent across system reboots and can be reused without resetting the value of sysUpTime.
In RFC 1213 mode, two parameters control the size of the ifIndex range and the total number of interfaces in the standard interface tables—maxIfIndex and maxIfNumber. There is no such control in the default interface numbering mode.
In RFC 1213 mode, interface creations should not result in gaps in the ifIndex range. A gap that results from the deletion of an interface is acceptable because it is handled by older network management applications. The gaps are eliminated after the router is rebooted. However, in the default interface numbering mode, large gaps occur from the creation of interfaces due to the use of the upper 8 bits of the ifIndex for interface type encoding. Gaps are not eliminated after a system reboot.
In RFC 1213 mode, small gaps can occur in the creation of IP interfaces when virtual routers are used. These gaps are minimized but not eliminated when the router is rebooted.
Rather than seeing an ifIndex value of 1 and 10066329, for example, a management client would see ifIndex values of 1 and 2.
bulkstats interfaces rfc1213
- host1(config)#bulkstats interfaces rfc 1213
| Copyright © 2008, Juniper Networks, Inc. All rights reserved. Trademark Notice. | |