Overlay Transport Virtulisation (OTV) is currently a feature on the Nexus 7000 product (M1 modules) range that provides DCI (Data Center Interconnect). It allows multiple data centers to be linked together and extends L2 Ethernet across them. OTV is different to EoMPLS & VPLS as a LAN extension …

I probably should have made notes on the Cisco Nexus platform and its features when I first started playing with them back in 2010/2011, it would have saved me running over it again and making new notes. Although quite a few new features have been introduced since then Key Features of the NXOS; VDC …

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 …

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 directly …

To configure HTTP on Cisco IOS; ip http server ip http access-class <ACL> ip http authentication aaa aaa authentication login default local ip http max-connections <number> ip http port <TCP port no> ip http timeout-policy idle <sec> life <sec> requests <no>

ip wccp web-cache interface se0/0 ip wccp web-cache redirect out ip wccp web-cache group-list

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 bakcup AVG AVG will …

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 vrrp brief

interface fa0/1 standby 1 priority 200 standby 1 preempt standby 1 10.1.1.1 standby 1 timers standby 1 authentication standby 1 name standby use-bia #uses the router MAC address rather than HSRP (0000.0c07.acxx xx=group) standby 1 mac-address #Alter the MAC address for the group standby 1 track …

service dhcp #enable DHCP on device ip dhcp pool #create DHCP pool with name network 10.1.1.0 /24 default-router 10.1.1.1 netbios-name-server 10.1.1.2 netbios-node-type h-node dns-server lease ip dhcp pool host 10.1.1.100 /24 hardware-address 0005.5e1f.8222 #create static binding (config)# ip dhcp …