Cisco Ex SERIES Uživatelský manuál stáhnout pdf (Strana 19)

Juniper Networks/Cisco Systems Switch Interoperability Cookbook

! ! !

The “no shutdown” command is mandatory for the Nexus 7010 and other devices

running the NX-OS operating system. It is optional for the Cisco Catalyst 3850 and other

switches running the IOS operating system.

Validation!

Generating a known quantity of jumbo frames between the client and server will validate

the ability of the switches to exchange jumbo traffic. This can be verified by examining

the interface counters on the switch ports where clients and servers are attached.

Alternatively, a test instrument can generate bidirectional jumbo frame traffic between

the switches. Both switches should forward all jumbo frames with zero frame loss.

Layer@3&virtual&private&networks&(L3&VPNs)&

Objective!

To verify the ability of Juniper and Cisco switches to use BGP to create a VPN tunnel

over an MPLS-based network.

To verify the ability of Juniper and Cisco switches to forward traffic over an L3 VPN.

Background!

MPLS-based VPNs provide virtual, routable IP tunnels across an MPLS network. As

described in IETF RFC 4364, customers use BGP routing to set up these tunnels, with no

visibility of the service provider’s underlying MPLS transport.

MPLS-based VPNs offer advantages over conventional IP-based VPNs for enterprises

and service providers in terms of scalability and ease of configuration. Conventional

VPNs typically require fully meshed networking among all sites requiring VPN

connectivity. Moreover, each router must be reconfigured each time a site is added or

deleted. In contrast, a change in one site in an MPLS-based VPN requires reconfiguration

only of the service provider’s edge router at that site.

Topology!

This example models a service provider’s MPLS network with provider edge (PE) and

provider (P) devices, as well as customer edge (CE) devices representing an enterprise

network. In this case, a Juniper MX80 router acts as the P device. A Juniper Virtual

Chassis (comprising two Juniper EX9208 switches) and a Cisco Nexus 7010 act as PE

devices. A Juniper Virtual Chassis Fabric (comprising two Juniper QFX5100 and one

Juniper EX4300 switches) and a Cisco Catalyst 3850 act as CE devices.

The PE devices run MP-BGP (multiprotocol BGP) and OSPF routing protocols,

redistributing routes learned from the L3 VPN into OSPF for use by the CE devices. The

PE and P devices also run MPLS Label Distribution Protocol (LDP). The PE devices also

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Cisco Ex SERIES Uživatelský manuál Strana 19