Cabletron Systems DMS-100 manual Introduction to the EIU

Chapter 1: Introduction to the EIU 35

—programs were not aware that a period of time had elapsed

—The router stopped routing packets.

The EIU remained fully functional throughout the broadcast storm test. Although traffic from the EIU stopped, this stoppage was due to all other components on the LAN being nonfunctional and there was nothing left for the EIU to communicate with. The test demonstrated that maintenance personnel could remote login to the EIU, start a CI process, look at some OMs, and remote logout. The EIU could also successfully complete an in- service test and could be manual busied, then returned to service after successfully completing the out-of-service test.

•IP throttling was introduced to address customer concerns on co-residency of EIUs with other ASUs in an LPP frame. The IP throttling feature provides partial protection for the DS30 links at the expense of EIU throughput. Similarly, throttling has been implemented for EIUs on FLIS and SNSE LIS to protect the links between the MS and EIU from overloading.

When deployed, fiber SR128 links through the MS will provide enhanced capacity to alleviate link capacity overload.

•The SNSE LIS and LPP have been product integrity tested with up to eight EIUs. Capacity engineering rules restrict the number of EIUs supported per platform to less than eight. Refer to Provisioning Rules for LPP, SSLPP, and SNSE LIS, System Engineering Bulletin SEB 92-02-001.

•The DMS-100 switch supports a maximum of eight EIUs per switch. Each of the eight EIUs can be configured on a separate LAN. However, EIUs configured on the same LAN can provide simple load balancing of IP traffic between EIUs, and tolerance to failure of a single EIU. For more information on redundancy and sparing, refer to “EIU sparing and redundancy” on page 41.

•The EIU can screen IP packets whereby only IP packets from a specified list of source IP address are accepted into the SuperNode switch and others rejected. This list of IP addresses is bound in by and is the responsibility of user applications (for example, EXNDINV).

•OSI and TCP/IP protocols cannot co-exist on the EIU.

•Theoretically, the EIU is capable of routing approximately 350 kbyte/s with 1536 kbyte packets at the IP level. That measurement equals about 2.5 Mbit/s. This performance measurement is the rate at which the EIU routes to the F-bus. However, throttling values limit throughput. Refer to Provisioning Rules for LPP, SSLPP, and SNSE LIS, System Engineering Bulletin SEB 92-02-001.

DMS-100 Family EIU User Guide TELECOM12