Timers Flashcards
UDLD expiration time?
40 Seconds
VRRP default timer
1 second
A virtual router must use 00-00-5E-00-01-XX as its Media Access Control (MAC) address. The last byte of the address (XX) is the Virtual Router IDentifier (VRID), which is different for each virtual router in the network. This address is used by only one physical router at a time, and it will reply with this MAC address when an ARP request is sent for the virtual router’s IP address.
Physical routers within the virtual router must communicate within themselves using packets with multicast IP address 224.0.0.18 and IP protocol number 112.[4]
Routers have a priority of between 1-254 and the router with the highest priority will become the master. The default priority is 100, for address owner the priority is always 255.
LLDP timer
30 seconds
HSRP Hold Timer
10 Seconds
CDP hold timer
180 seconds
CAM Address table timeout?
300 Seconds
Default CDP timer
60 seconds
GBLP Hold Timer
10 Seconds
UDLD hold timer
5 Seconds
VRRP hold timer
3x hello timer = 3 seconds
HSRP Hello Timer
3 Seconds
VTP Advertisements
300 Seconds + every change
errdisable recovery cause all
What is the default timer before ports are reset?
300 Seconds
802.1D BPDU Timer
2 Seconds
GBLP Hello Timer
3 Seconds
By default, GLBP routers use the local multicast address 224.0.0.102 to send hello packets to their peers every 3 seconds over UDP 3222 (source and destination).
