Cisco Ex SERIES Uživatelský manuál stáhnout pdf (Strana 21)

Juniper Networks/Cisco Systems Switch Interoperability Cookbook

! ! !

Juniper!configuration!

Juniper Virtual Chassis Fabric (CE device):

With L3 VPNs, no special configuration is needed for CE routers. Indeed, unlike

conventional VPNs, the CE routers do not require fully meshed connectivity with all

other sites using VPN tunneling.

In this example, the CE devices run OSPF to exchange information with the PE routers.

The CE devices also could use static routes or other dynamic routing protocols such as

IS-IS or BGP. Again, no MPLS or VPN awareness is required.

1. Configure IP addresses for interfaces xe-1/0/2 (connected with the Cisco Nexus 7000)

and xe-1/0/40 and ge-2/0/2 (connected with the Spirent TestCenter test instrument via the

Juniper QFX5100 and Juniper EX4300 switches, respectively, within the Virtual Chassis

Fabric):

VCF> configure

VCF# set interfaces xe-1/0/2 description "to Nexus 7010 int e3/3"

VCF# set interfaces xe-1/0/2 unit 0 family inet address 192.18.68.2/24

VCF# set interfaces xe-1/0/40 description "VCF5100 to stc"

VCF# set interfaces xe-1/0/40 unit 0 family inet address 192.18.99.1/24

VCF# set interfaces ge-2/0/2 description "VCF4300 to stc"

VCF# set interfaces ge-2/0/2 unit 0 family inet address 192.18.98.1/24

2. Enable OSPF on the interfaces defined in the previous step:

VCF# set protocols ospf area 0.0.0.0 interface xe-1/0/2.0

VCF# set protocols ospf area 0.0.0.0 interface xe-1/0/40.0

VCF# set protocols ospf area 0.0.0.0 interface ge-2/0/2.0

VCF# commit

The PE devices will redistribute into BGP any routes learned via OSPF from the CE

devices, and the L3 VPN in turn will forward these routes to other sites with VPN

tunnels.

On Juniper Virtual Chassis (PE device):

With L3 VPNs, the PE devices require the most extensive configuration. The steps

involved include the following:

• Configuring a loopback address

• Configuring addresses on interfaces connected to CE and P devices

• Enabling LDP

• Enabling MPLS

• Configuring a backbone IGP (in this case, OSPF)

• Configuring MP-BGP

• Enabling at least one VRF instance

• Configuring routing protocols for each VRF instance (or static routes)

• Redistributing routes learned from CE devices into MP-BGP

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Cisco Ex SERIES Uživatelský manuál Strana 21