Cisco Dynamic Route configuration-in-Kernel

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Cisco configures dynamic routing, which can be configured using the enhanced internal gateway routing protocol.

Supports:

Fast Convergence: dual (dispersion update algorithm) is used to achieve rapid convergence.

Effective use of bandwidth: Send partial or Incremental Route updates, instead of sending the entire route table, to achieve effective use of bandwidth.

Supports multiple network layer protocols: Use a protocol-independent module (PDM) to support IP, IPX, appletalk, and other protocols.

Supports vlsm (variable-length subnet mask) and CIDR (classless Inter-Domain Routing)

Idea: configure the port IP addresses of each vro separately

Configure the CIDR blocks of the vrouters

R1 # conf t

Enter configuration commands, one per line. End with cntl/Z.

R1 (config) # int fa 0/0

R1 (config-If) # IP add 1.1.1.1 255.255.255.0

R1 (config-If) # No sh

R1 (config-If) # exit

R1 (config) # fig?

<1-65535> autonomous system number // autonomous system number

R1 (config) # router VPN 10

R1 (config-router) # network 1.1.1.0 0.0.255

R2 (config) # int fa 0/0

R2 (config-If) # IP add 1.1.1.2 255.255.255.0

R2 (config-If) # No sh

R2 (config-If) # exit

R2 (config) # int fa 1/0

R2 (config-If) # IP add 2.2.2.2 255.255.255.0

R2 (config-If) # No sh

R2 (config-If) # exit

R2 (config) # router VPN 10

R2 (config-router) # network 1.1.1.0 0.0.255

R2 (config-router) # network 2.2.2.0 0.0.0.255

R3 (config) # int fa 0/0

R3 (config-If) # IP add 2.2.2.3 255.255.255.0

R3 (config-If) # No sh

R3 (config-If) # exit

R3 (config) # router VPN 10

R3 (config-router) # network 2.2.2.0 0.0.0.255

Configuration complete.

You can view the topology data structure of the VPN gateway on the R1 through the sh ip address VPN top.

R1 # SH ip address: VPN top

IP-EIGRP topology table for AS (10)/ID (1.1.1.1) // autonomous system number 10

Codes: p-passive, A-active, U-Update, Q-query, R-reply,

R-reply status, S-sia status

P 1.1.1.0/24, 1 successors, FD is 28160

Via connected, fastethernet0/0

P 2.2.2.0/24, 1 successors, FD is 30720

Via 1.1.1.2 (30720/28160), fastethernet0/0

Run the command SH ip route VPN to view the Routes learned by iver1.

R1 # SH ip route VPN

2.0.0.0/24 is subnetted, 1 subnets

D 2.2.2.0 [90/30720] via 1.1.1.2, 00:25:42, fastethernet0/0

Thank you for your advice.