求助300-101

mvyy1231

如下所示Which two statements about EVN are true?（ choose two）
A. It supports IPv6 traffic.
B. It can support up to 16 VNs.
C. It uses redistribution to share routes between VNs.
D. It supports SSM only.
E. A configuration can be based on an existing VRF configuration  



CE? AE?
哪位大大能给解答一下？

sherry0817

the answer is CE

hofriendly

Correct Answer: CE

Explanation/Reference:
Explanation

Multi-VRF achieves route exchange between VNs by redistributing VN routes indirectly through BGP using the route-target import/export feature.

Reference: https://www.cisco.com/c/en/us/pr ... s-software/layer-3- vpns-l3vpn/ whitepaper_c11-638769.html

The following are not supported on an EVN trunk:
+ Access control lists (ACLs)
+ BGP interface commands are not inherited
+ IPv6, except on vnet global -> Only vnet global (is also known as the default routing table) supports IPv6 -> A is not correct.
+ Network address translation (NAT)
+ NetFlow
+ Web Cache Communication Protocol (WCCP)

Reference: https://www.cisco.com/c/en/us/td ... guration/xe-3s/evn- xe-3s-book/evn- overview.html

According to this Cisco document EVN supports up to 32 VNs and EVN supports both SM and SSM modes: Network virtualization solution EVN:
+ Provides a pure IP alternative to MPLS in enterprise networks for up to 32 VNs -> B is not correct.
+ Uses existing enterprise  design/architecture/protocols  +  Uses  existing  technology  to  increase  the effectiveness of VRFs + Provides either an IGP  (OSPF,  EIGRP)  only  or  IGP/EGP-based  alternative Reintroduces familiar concepts for access and trunks  to Layer 3 + Can be deployed with traditional MPLS VPNs   or MPLS VPNs over mGRE + Can coexist with Multi-VRF deployments
+ Supports non-IP and IPv6 traffic through the EVN global table + Supports PIM and IGMP with SM and SSM modes for mVPN -> Answer D is not correct.
+ Supports shared services using route replication + Includes enhanced troubleshooting and usability tools: routing context, traceroute, debug condition, cisco-vrf-mib, and simplified VRF-aware SNMP configuration

For answer E, it should be understood like this: different VRF configurations may have the same configuration (like IP addresses, interfaces, AS numbers...)