CONFIGURING JUNIPER-CISCO GRE TUNNEL

Command Line Ninja

How to configure GRE tunnel between Juniper and Cisco.

Tools/Software Needed:

GNS3 1.3.3
Virtual Box running JUNOS 12.1R1.9 (Olive)
Cisco c2691-adventerprisek9-mz.124-23.image

Configuration:

First we have to configure ISP devices to simulate WAN connectivity across the sites.

ISP1 Configuration

!Enter Privilege and Global Configuration Mode
enable
configure terminal

! Configure the interfaces
interface FastEthernet0/0
ip address 1.1.1.1 255.255.255.252
no shut
exit

interface FastEthernet/1
ip address 2.2.2.1 255.255.255.252
no shut
exit
!End of Interfaces Config

! Configure EIGP as Interior Gateway Protocol to allow communication between fa0/0 to fa0/1.
router eigrp 90
no auto-summary
network 1.1.1.0 0.0.0.3
network 2.2.2.0 0.0.0.3
exit

! Configure BGP as Exterior Gateway Protocol to allow communication between ISP.
router bgp 65000
no auto-summary
neighbor 2.2.2.2 remote-as 65001
neighbor 2.2.2.2 soft-reconfiguration inbound
network 1.1.1.0 mask 255.255.255.252
end

!Save changes to memory
write memory

+++END OF CONFIG FOR ISP1+++

ISP2 Configuration

! Enter Privilege and Global Configuration Mode
enable
configure…

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