EIGRP

Network statement does not control what networks are being advertised but instead what interfaces are running EIGRP process Uses protocol number 88 Multicast to 224.0.0.10 (TTL=0) Receiving neighbour unicasts are acknowledged Unequal cost load sharing of up to 16 links EIGRP does not form neighbours over…

ODR

In a small hub and spoke (where spokes are stubs) you could use On Demand Routing (ODR) to achieve full readability between sites. ODR uses CDP as its transport . CDP versions must match. ODR will auto-inject a default route in the spoke routers and the spoke routers will advertise their…

GLBP

Provides gateway redundancy by using a singe IP and multiple MAC Can be 4 routers in a group Group members communicate to 224.0.0.102 on UDP-3222 Hello messages sent every 3 seconds by default Group members will elect a Active Virtual Gateway (AVG), the other routers will be…

VRRP (Cisco)

interface fa0/1 vrrp 1 ip 1.1.1.1 vrrp 1 priority 200 vrrp 1 advertise #advertisement timer in seconds vrrp 1 timer learn #learns timer from master router vrrp 1 authentication vrrp 1 description no vrrp 1 preempt #preempt is on by default with VRRP show vrrp show…

RIP Configuration

The following are the various RIP configuration commands on Cisco routers. Notes on RIP can be found here. RIP router rip network #subnet to advertise/enable RIP on passive-interface #dont send/process updates neighbour #unicast message to destination IP offset-list (in|out) #manipulate route metric version (2|1) #RIP version…

RIP

General RIP UDP-520 2 message types; - Request Message (used to ask neighbours to send updates) Response Message (Carries an update) Metric is hop-count On startup RIP broadcasts a request message packet out each RIP enabled interface - The RIP process then enters a loop - Listening for RIP requests…