Dell PowerConnect FCS624S Configuration Guide - Page 406

10 Virtual Switch Redundancy Protocol (VSRP) Timer scale The VSRP Hello interval, Dead interval, Backup Hello interval, and Hold-down interval timers are individually configurable. You also can easily change all the timers at the same time while preserving the ratios among their values. To do so, change the timer scale. The timer scale is a value used by the software to calculate the timers. The software divides a timer value by the timer scale value. By default, the scale is 1. This means the VSRP timer values are the same as the values in the configuration. VSRP-Aware security features This feature protects against unauthorized VSRP hello packets by enabling you to configure VSRP-aware security parameters. Without VSRP-aware security, a VSRP-aware device passively learns the authentication method conveyed by the received VSRP hello packet. The VSRP-aware device then stores the authentication method until it ages out with the aware entry. The VSRP-aware security feature enables you to perform the following: • Define the specific authentication parameters that a VSRP-aware device will use on a VSRP backup switch. The authentication parameters that you define will not age out. • Define a list of ports that have authentic VSRP backup switch connections. For ports included in the list, the VSRP-aware switch will process VSRP hello packets using the VSRP-aware security configuration. Conversely, for ports not included in the list, the VSRP-aware switch will not use the VSRP-aware security configuration. If VSRP hello packets do not meet the acceptance criteria, the VSRP-aware device forwards the packets normally, without any VSRP-aware security processing. To configure VSRP-Aware Security features, refer to "Configuring security features on a VSRP-aware device" on page 369. VSRP parameters Table 63 lists the VSRP parameters. TABLE 63 Parameter VSRP parameters Description Default Protocol VSRP state Enabled NOTE: On a Layer 3 Switch, you must disable VSRP to use VRRPE or VRRP. Virtual Router ID (VRID) The ID of the virtual switch you are creating by configuring multiple devices as redundant links. You must configure the same VRID on each device that you want to use to back up the links. None Timer scale The value used by the software to calculate all VSRP 1 timers. Increasing the timer scale value decreases the length of all the VSRP timers equally, without changing the ratio of one timer to another. See page... page 368 page 367 page 368 364 PowerConnect B-Series FCX Configuration Guide 53-1002266-01