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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