Archive for the ‘CCNP Notes’ Category

Posted by keith.wirch at September 13, 2017

Category: CCNP Notes

ProtocolHSRP (Hot Standby Router Protocol)
CISCO - PROPRIETARY
VRRP (Virtual Router Redundancy Protocol)
MULTI-VENDOR
GLBP (Gateway Load Balancing Protocol
CISCO PROPRIETARY
TerminologyActive/StandbyMaster/BackupActive virtual Gateway (AVG)/Standby Virtual Gateway(SVG)/Active Virtual Forwarder(AVF)
Virtual MACAll participants share the MAC address that is passed between whoever is the active gateway.All participants share the MAC address that is passed between whoever is the master gateway.Gateway MAC is different for each member within the group.
Communication MethodIP Multicast
224.0.0.2 (v1) (popular)
224.0.0.102 (v2)
IP Multicast
224.0.0.18 (IPv4)
FF02::12 (IPv6)
IP Multicast
224.0.0.102
Authentication OptionsDefault: None
Plain Text
MD5
Default: None
Plain Text
MD5
Default: None
Plain Text
Active SelectionHighest Priority wins!

Default: 100
Highest Priority wins!

Default: 100
Highest Priority wins! There is SVG still chosen but the rest are in a listen state.

Default: 100
TimersHELLO - Messages exchanged between routers. Default is 3 seconds.
HOLD - TIme the router will hold until it doesn't receives Hello message assumes the Active is gone. Default is 10 seconds.
Similar to HSRP.
Hello Default is 1 second and Hold timer is 3 seconds.
Again, similar to HSRP. Hello default is 3 seconds and the Hold timer is 10 seconds.
Preemption DefaultsOffOnOff

Some of these were taken from here.  But I put a little of my own spin on it.

Posted by keith.wirch at August 17, 2017

Category: CCNP Notes

Access
This will put the interface in a permanent non-trunking mode.  With exception of a Voice VLAN, only one vlan will pass over this port.  The port will NEVER become a trunking port.

Trunk
This will put the interface in a permanent trunking mode.  Allowed VLANs allowed on the trunk will pass.  VTP will also pass traffic over this port.  DTP packets will be sent to ask the other side to become a trunk.  If the other side does not respond, the port will become a trunk anyway.

Nonegotiate
This will cause the interface to not send DTP packets.  Meaning that it will not attempt to negotiate as a trunk.  But if the port does receive a DTP packet that it wants to become a trunk, it will become a trunk.

Dynamic Desirable
When a port comes up with this configuration, it will ask the other side “Hey, wanna be a Trunk?”.  In other words, it will actively try to be a trunk.  But it will cause port to the function of an access port if needed.

Dynamic Auto (DEFAULT)
In this configuration, the port will become a trunk if asked to but otherwise just stays a regular access port otherwise.