Gre edge

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Default to the imposed GRE header. With the last hop at the final destination, Router 3 sends a VLAN tagged packet to a switch (see Packet View 4). Observe that the GRE header was stripped and a Dot1Q header was added due to the VLAN configuration. The precedence portion of the user's DSCP 0 ( 000 000) is copied by default to the COS bits of the VLAN header. The COS value set is 0 (000). Example 2: Indicating Service-Class by Marking at the Network's Edge Figure 3. Indicating Service-Class by Marking at the Network's Edge In this example, we modify the default behavior by remarking the DSCP of users' traffic in an ingress policy as it enters Router 1. The following code shows how we do this: ip access-list extended 101 permit udp any any range 16384 32767!class-map video match access-group 101!policy-map traffic-marking class video set dscp AF41!int gig1/0/0 service-policy in traffic-marking Let's say that we designate video traffic as DSCP AF41 throughout the network. When the packet reaches the GRE interface on egress, its DSCP value has already been changed to AF41 and its behavior matches that in Example 1. We send the stream through a GRE tunnel (possibly encrypted) as it traverses the providers network. Notice how the newly-marked DSCP codepoint (AF41) is copied by default to the imposed GRE header. When we arrive at our destination, the router sends a VLAN-tagged packet to the last hop (a switch). The precedence portion of the users' DSCP value is copied by default into the COS bits of the VLAN header. As our DSCP is now AF41 (100 010), the COS value will be 4 (100). For command details, refer to the command page set dscp. Example 3: Remarking Traffic to Match Service Provider Requirements Figure 4. Remarking Traffic

IOS XE Fuji 16.7.1 Open Source Licensing Information (Guest Shell x86) for Cisco IOS XE Fuji 16.7.1 (PDF - 3 MB) Open Source Licensing Information for Cisco IOS XE Fuji 16.7.1 (PDF - 9 MB) Technical References In-Service Software Upgrade (ISSU) Install and Upgrade Install and Upgrade Guides Cisco IOS XE Fuji 16.9.1 IP Addressing: NAT Configuration Guide, Cisco IOS XE Gibraltar 16.10.x Cisco IOS XE Gibraltar 16.10.1 Cisco VG400 Voice Gateway Hardware Installation Guide Denali 16.2 Cisco IOS XE Denali 16.2 Migration Guide for Access and Edge Routers Cisco IOS XE Denali 16.3 Migration Guide for Access and Edge Routers MPLS Basic MPLS Configuration Guide Configuration Configuration Examples and TechNotes Configure and Capture Embedded Packet on Software Configure Smart Licensing for IOS Enterprise Routing Platforms Configure NETCONF/YANG for Cisco IOS XE 16.X Platforms Filter Traffic Destined to Cisco IOS XE Devices WebUI Using an Access List Understand Best Practices and Useful Scripts for EEM Examples and Technotes, Cisco IOS XE Release Denali 16.1.1 QoS Monitoring Configuration Guides IP Switching Cisco Express Forwarding Configuration Guide, Cisco IOS XE Gibraltar 16.10.x IP Routing: GRE Configuration Guide, Cisco IOS XE 16 (Cisco NCS 4200 Series) IP Routing: GRE Configuration Guide, Cisco IOS XE 16 (Cisco ASR 920 Series) IP Routing: GRE Configuration Guide, Cisco IOS XE 16 (Cisco ASR 900 Series) Cisco Discovery Protocol Configuration Guide, Cisco IOS XE Gibraltar 16.12.x QoS Modular QoS Command-Line Interface Configuration Guide, Cisco IOS XE Gibraltar 16.12.x Software Activation Configuration Guide, Cisco IOS XE Everest 16.6.x

MVPN(Multicast VPN) IPv4/GRE IPv4 Supported DMVPN(dynamic multipoint VPN) Supported Multipoint GRE Supported MPLSoGREv4 IPv4/GRE MPLS Not supported MPLSoGREv6 IPv6/GRE MPLS Not supported L2TP IPv4/L2TP PPPoX Not supported When a new header is added (encapsulated), any QoS marking in the inner header is copied to the outer header. For example, when an IP datagram is encapsulated with an MPLS header, the default behavior is to copy the IP Precedence bits from the IP header to the MPLS EXP bits in the newly-imposed header. Regarding header disposition, we typically do not copy any outer marking(s) to the inner header. For example, at the endpoint for a GRE tunnel, let's say that we receive a packet with different DSCP values in the outer and inner IP headers. When we remove the outer header we do not copy its DSCP value to the inner header. For examples of configuring Imposition Marking, see Example 4: Configuring Tunnel Imposition Marking and Example 5: Using Tunnel Imposition Marking to Remark for an SP Network. For command details, please refer to set mpls experimental imposition, set dscp tunnel, and set precedence tunnel. Configuration ExamplesExample 1: Configuring Ingress MarkingExample 2: Configuring Egress MarkingExample 3: Configuring MPLS EXP ImpositionExample 4: Configuring Tunnel Imposition MarkingExample 5: Configuring QoS-Group MarkingExample 6: Configuring Discard-Class MarkingExample 1: Configuring Ingress Marking You can set up a trust boundary at the edge of a network (where marking is used) to indicate service-class for some traffic and to bleach all other traffic (see *** below). Enforcing a trust boundary at all ingress ports to the network allows you to maintain control of which applications are mapped to each service-class within the network: policy-map ingress-marking class voice set dscp ef class video set dscp af41 class scavenger set dscp cs1 class class-default *** set dscp 0 *** !interface

Strip off the outer headers and then route the inner packet can handle any packet sent over the tunnel.In the event of a network outage or other issues, tunnels fail over automatically — with no impact to a customer’s network performance.Deployment Architectures for Magic TransitDefault Configuration (Ingress Only, Direct Server Return)By default, Magic Transit processes traffic in the ingress direction only (from the Internet to the customer network). The server return traffic back to the clients is routed by the customer's DC edge router via its uplinks to the Internet/ISP based on the edge router’s default routing table. This server return traffic will not transit through Cloudflare via tunnels. This is referred to as Direct Server Return (DSR).The network diagram in Figure 2 illustrates such a Magic Transit setup, and the end-to-end packet flow of Magic Transit-protected traffic. The tunnel in this setup uses GRE for encapsulation.Figure 2: Reference Configuration of Magic Transit anycast Tunnel (GRE) With Default DSR OptionCloudflare provides the customer with a pair of anycast IP addresses for the Cloudflare end of the tunnel endpoints. These are publicly routable IP addresses from Cloudflare-owned address space. The pair of anycast IP addresses can be used to configure two tunnels for network redundancy, although only one is required for a basic configuration. The above configuration shows a single tunnel, with the Cloudflare end of the tunnel endpoint address being 192.0.2.1.The customer end of the anycast GRE tunnel needs to be a publicly routable address. It is typically the IP address of the WAN interface on the customer edge router. In this example it is 192.0.2.153.The IP addresses of the tunnel interfaces are RFC 1918 private addresses. These addresses are only "locally significant" within the particular Magic Transit service instance that they are part of. Therefore, the customer can select any RFC 1918 addresses they desire, as long as they do not overlap with those of other tunnels configured within the same Magic Transit service instance.As best practice, given the tunnels are point-to-point connections, a /31 subnet is sufficient for allocating the 2 IP addresses required for a given tunnel. In the above example, the 10.10.10.0/31 subnet is chosen, with the Cloudflare end of the tunnel interface being 10.10.10.0/31 and the customer's DC edge router side being 10.10.10.1/31.Once the tunnel is configured, a route is configured in the Magic Transit service instance to forward traffic destined to a given customer prefix onto the correct tunnel.Traffic destined to customer prefix 203.0.113.0/24 is routed onto the tunnel whose remote end (i.e. the customer’s end, from the Cloudflare network's perspective) of the tunnel interface is 10.10.10.1.Given this is a Direct Server Return (DSR) setup, the server return traffic follows the default route (ip route 0/0) configured on the customer edge router and is sent to its uplink peer (i.e. customer’s ISP's router), en route back to the clients over the Internet. This return traffic does not traverse Cloudflare network.Note: The smallest IP prefix size (i.e. with the longest IP subnet mask) that most