Use LEFT and RIGHT arrow keys to navigate between flashcards;
Use UP and DOWN arrow keys to flip the card;
H to show hint;
A reads text to speech;
21 Cards in this Set
- Front
- Back
availability
|
ability of a user group to access a desired system or resource
|
|
downtime
|
a period when system or resource is unavailable
|
|
HA features
|
GR, GRES, NSR, BFD, VRRP, ISSU
|
|
graceful restart (GR)
|
allows uninterrupted packet forwarding and temporary suppresion of all routing protocol updates
|
|
graceful routing engine switchover (GRES)
|
enables a platform with redundant REs to continue forwarding packets if one RE fails
|
|
nonstop active routing (NSR)
|
saves routing protocol information during RE switchover by running protocol process on backup RE; requrires GRES
|
|
bidirectional forwarding detection (BFD)
|
hello mechanism that detects failures in a network
|
|
virtual router redundancy protocol (VRRP)
|
enables hosts no a LAN to make use of redundant routing platforms without requiring more than one default route on hosts
|
|
unified in-service software upgrade (ISSU)
|
allows upgrade between two different OS releases with no disruption on the control plane and minimal disruption of traffic; supported only on dual RE platforms, also GRES and NSR must be enabled
|
|
protocols that support GR
|
ospf, is-is, bgp, rip, rsvp, ldp, msdp, pim
|
|
protocols that support BFD
|
ospf, is-is, rip, bgp, rsvp, pim, static routes
|
|
vrrp router
|
any router participating in vrrp including master and backup
|
|
master router
|
vrrp router performing packet forwarding and responding to ARP requests
|
|
backup router
|
vrrp router available to assume role of master upon failure
|
|
virtual router
|
virtual entity that functions as default router on LAN; consists of virtual router ID and ip address used as gateway address known as VIP
|
|
virtual mac address
|
00-00-5E-00-01-VRID; where VRID is the group number
|
|
vrrp states
|
initialize, master, backup, transition
|
|
initialize vrrp state
|
router negotiates VRRP roles through startup events; no forwarding can be performed
|
|
master vrrp state
|
router assumes traffic forwaqrding responsibilities for LAN and responds to ARP requests
|
|
backup vrrp state
|
router monitors master vrrp router and is ready to assume forwarding responsibilities if failure occurs
|
|
transition vrrp state
|
backup router in the process of becoming master |