In this example we demonstrate interoperability of mikrotik 3. Design considerations this section describes the rationale for using the multiple instance id approach to support multiple address families in ospfv3. This document cover basic ospfv3 connectivity, ospfv3 authentication and ospfv3 configuration using flex cli on ios xr. This field indicates the ip address of the interface to which this neighbor is directly connected. To get up to speed regarding ospf, please go over these resources. Mar 06, 2014 this article will be about ospfv3 which is the ospf protocol that can be configured for ipv6 as well. I want to test the relation between instance id and ospfv3 process id, so i connected 2 routers via gig interface with 3 different subinterfaces.
It maps an af to an ospfv3 instance using the instance id field in the ospfv3 packet header. The ietf kept updating ospf version 3 and since rfc 5838 it supports address families just like bgp. The process id identifies the ospfv3 instance and is local to the router. Ospfv3 can be used as a provideredgecustomeredge pece routing protocol as specified in rfc 6565, ospfv3 as a provider edge to customer edge pece routing protocol. Ospfv3 instance id address family values registration procedures standards action reference note these values for instance id are applicable when is used to support multiple address families. There are many reasons as to why youd need to get into ospfv3 router configuration mode such as configuring the routerid or setting the default information or distribute list. This document supports these other afs in ospfv3 by mapping each af to a separate instance id and ospfv3 instance. This chapter describes how to configure rfc 2740compliant open shortest path first version 3 ospfv3 for an ipv6 network. The instance id field may be used for applications other than the support of multiple address families. Ospfv3 in a nondefault vrf instance supports routing of ipv4 and ipv6 address families. Aug 04, 2016 ospfv3 can be used as a provideredgecustomeredge pece routing protocol as specified in rfc 6565, ospfv3 as a provider edge to customer edge pece routing protocol. Ospfv3 includes a mechanism to support multiple instances of the protocol running on the same interface. There are however differences in the implementation of both protocols as these are two completely independent protocols, depending on the vendor and sometimes even on the model. The ospfv3 header includes an instance id field to identify that ospfv3 packet for a particular ospfv3 instance.
Ospfv3 routers will only become neighbors if the instanceids match. The instance id field also reflects another dramatic change, in that routing protocols for ipv6 are more. The same instance must be enabled on interfaces between. Understanding multiple address families for ospfv3. To know details about software mappings, see hardware query tool. Different instances of the same lsa could be present. Rfc 5838 support of address families in ospfv3 ietf tools. In this example, ospfv3 is enabled on the sefos1 switch, and 10. It is possible that this is a failure of a over zealous anvl. Ospfv3 configuration s2750, s5700, and s6720 v200r008c00. A router uses the linklocal address as nexthop during packet forwarding for the neighbors attached to its links. Ospfv3 instance id address family values registry update the iana ospfv3 instance id address family values registry has been updated so that instance ids from 192255 are reserved for private use. By default, ospfv3 supports only unicast ipv6 routes.
Unlike ospfv3 where the instance id can be used for multiple. A comparison of ospfv3 and eigrpv6 in a small ipv6. If not explicitly configured, the highest logical ip address will be duplicated as the router identifier. The ospfv3 peer routerid command sets the dr priority and ipv6 addresses. Ospfv3 allows for multiple instances per link by adding an instance id to the ospf packet header to distinguish instances. Cisco nxos allows only one ospfv3 instance on an interface. Software configuration guide for the cisco 5900 embedded. The ospfv3 interface display verifies that sha1 authentication is in use. Ospfv2 vs ospfv3 the ipv6 version of ospf is ospfv3.
Ospfv3 options changes a new afbit has been added to the ospfv3 options field figure 4. In this document you will see basic ospv3 configuration on asr9k. This document defines the ospfv2 instance id to enable separate ospfv2 protocol instances on the same interface. One of the new features of ospfv3 is the ability to assign the router id, area id and linkstate id with a 32bit value without ip addresses. Those familiar with ospf for ipv4 will notice that the network commands are no longer used to indicate which interfaces will be entered into the ospf. The packet types and neighbor discovery mechanisms are the same in ospfv3 as they are for ospfv2. Instance id is a new field that is used to allow multiple ospfv3 protocol instances per link. Neighbor ospfv3 routers can have different process ids.
In order for 2 instances talk to each other they need to have the same instance id. Chirag shah instance id implies a separate ospfv3 instance with its own neighbor adjacencies, link state database, and spf computation. Abstract this document modifies the unassigned number space in the iana ospfv3 instance id address family. Because an interface has multiple instances, specify in which instance ospfv3 is enabled.
Ospfv3 options field with afbit when an ospfv3 router is supporting afs, the afbit will be set for hello packets. If the ospfv3 router ids of the two devices conflict, modify either of the ospfv3 router ids so that the both end have the same router id. For the remaining unassigned values 128191, the registration procedure is standards action. Support of address families in ospfv3 internetdraft, 2009 internetdraft ospfv3 af jul 2009 abstract this document describes a mechanism for supporting multiple address families in ospfv3 using multiple instances. In multiarea ospfv3, all areas are connected to the backbone area area 0 through area border routers abrs. However keep in mind the network command does not exist in ospfv3. This could happen due to misconfiguration or a router software downgrade. Ospfv3 changes the structure of some ospf lsas and uses a more direct approach to configuration, enabling ospfv3 on each interface using an interface subcommand. When you configure multiple address families for ospfv3, there is a new instance id field that allows multiple ospfv3 protocol instances per link. Ospfv2 is for ipv4 only and ospfv3 for both ipv4 and ipv6. Ospfv3 is unable to set its own router id like ospfv2 does. If no such conflict exists, proceed with the check. Rfc 6969 ospfv3 instance id registry update ietf tools.
We can use the show ipv6 ospf interface and show crypto ipsec sa commands as we did in the first section to verify ospfv3 authentication is in. By default it is 0 and for any additional instance it is increased, instance id has local link significance only. An interface assigned to a given instance id will drop ospf packets. The interface configuration process is just to assign an ospfv3 process id and area. This table lists only the software release that introduced support for a given feature. It is an area border router router is not originating router lsas with maximum metric.
We will discuss only what is specific to ospfv3 and the differences between ospf and ospfv3. Does this mean that ospfv2 ospfv3 instance learn the neighbor ip address from ipv4ipv6 header. However, when i clear the ospf or ospfv3 adjacency and packet capture hello packets, then those hello packets do not contain the ip address. This approach is fairly simple and minimizes extensions to ospfv3 for supporting multiple afs. Ospfv2 can utilize such a mechanism in order to support multiple routing domains on the same subnet. T1600,t640,srx3400,srx210,m series,mx series,ex series,ptx series,acx series. In this lesson, ill explain how to configure ospfv3 for ipv4. In ospfv3, instance id is a new field that is used to have multiple ospf process instance per link. The ospfv3 metric is still based on interface cost.
Unlike ospfv3 where the instance id can be used for multiple purposes, such as putting the same interface in multiple areas, the ospfv2 instance id is reserved for identifying protocol instances. Each instance id implies a separate ospfv3 instance with its own neighbor. Sure, this is possible, depending on the router model and software. The biggest differences between ospfv3 and the older ospfv2 lay with internals and with configuration.
The same instance must be enabled on interfaces between which the neighbor relationship is set up. The paper uses the opnet network simulation software to simulate and analyze the performance of ospfv3, and found that both the. With ospfv3, you can run multiple instances of the ospf protocol over a single link. Ospfv3 configuration in multiarea deployment icnd2 200105. Ospfv3 carries the instanceid inside its packets this makes possible things that were not possible in ospfv2 for ipv4. Sep 03, 2008 the above configuration enables ipsec authentication for all of r1s interfaces in area 0 which in our case is just serial10. Ccnp route chapter 3 lab 33, ospfv3 address families. The most recent instance could be identified using ls age, ls sequence number and ls checksum fields present in the lsa header. Ospfv3 is the ipv6capable version of the ospf routing protocol. This document describes a mechanism for supporting multiple address families afs in ospfv3 using multiple instances. It is a rewrite of the ospf protocol to support ipv6, although the foundation remains the same as in ipv4 and ospfv2. Ospfv3 is a linkstate routing protocol for ipv6 as its predecessor ospfv2 in ipv4.
Enabling ospfv3 on an interface s1720, s2700, s5700, and. Multiple instances on the single link can be achieved using instance id contained in the ospf packet header. Instance id is a new field that is used to allow multiple. This is accomplished by assigning an ospfv3 instance id number. Open shortest path first version 3 ospfv3 is a link state routing protocol. This feature enables ospfv3 to be routable over almost any network layer protocol.
A new afbit has been added to the ospfv3 options field figure 4. This identifier must be established in every ospf instance. Ospfv3 instance id address family values registry update the iana ospfv3 instance id address family values registry has been updated so that instance ids from 192255 are reserved for private. Does this mean that ospfv2ospfv3 instance learn the neighbor ip address from ipv4ipv6 header. Minimum hold time between two consecutive spfs 0 msecs.
To display a summary of ospfv3enabled interfaces, issue the show ipv6 ospf interface brief command. If no instance id is specified, the value defaults to 0. An instance id implies a separate ospfv3 instance with its own neighbor adjacencies, link state database, and spf computation. An interface that is assigned to an instance id drops packets that contain a different id. This header contains enough information to uniquely identify each lsa. As described earlier, ospfv3 is designed to support multiple instances. Flexible command line interface cli configuration groups provide the ability to minimize repetitive configurations by defining a series of configuration statements in a configuration group, and then applying this group to multiple hierarchical levels in the router configuration tree. This allows a single link to belong to multiple areas.
Notable is that ospfv3 has few similarities with that of ipv4 version i. It is open shortest path first version 3, or ospfv3, for internet protocol version 6, or ipv6. Gaia supports ospfv2, which supports ipv4 addressing, and ospfv3, which supports ipv6 addressing. The interface drops all ospfv3 packets that do not have a matching ospfv3 instance id in the packet header. When it comes to a multiarea ospf implementation, if you know multiarea ospf implementation for version 2 you know it for version 3. It maps an address family af to an ospfv3 instance using the instance id field in the ospfv3 packet header. Instead, you have to manually configure the router id. A comparison of ospfv3 and eigrpv6 in a small ipv6 enterprise. Area border routers, autonomous system boundary routers, dijkstras algorithm, none of that has changed. This document modifies the unassigned number space in the iana ospfv3 instance id address family values registry by. This article will be about ospfv3 which is the ospf protocol that can be configured for ipv6 as well. The ls type, link state id and the advertising router field are used to uniquely identify an lsa. When an ospfv3 router is supporting afs, the afbit will be set for hello packets, database description packets, and lsas. You can run ospf over a routebased vpn by enabling ospf on a virtual tunnel interface vti.
After enabling ospfv3 in the system view, enable ospfv3 on an interface. Configures an instance of the ospfv3 process in the vrf routing table for the ipv6 address family and enters address family configuration mode. By default, it is 0, and for any additional instance it is increased. It is configured as a 32bit value, same as in ospfv2. In order to have two instances talk to each other, they need to have the same instance id. However, ospfv3 is configured and operates independently of any implementation of ospfv2 on the switch. I used process id 1 with 3 instance ids on one router but configured 3 different processids, 1, 10 and 30, with 3 different instance inds on another router. Understanding multiple address families for ospfv3, example. This means we dont have to run ospfv2 and ospfv3 next to each other, one routing instance supports ipv4 and ipv6 at the same time. Check whether the ospfv3 area configurations on the two devices are consistent.
Using multiarea ospfv3 in large ipv6 network deployments can reduce router processingcycles by creating smaller routing tables and requiring less memory overhead. Ospfv3s packet header is now far less complex compared to that of ospfv2 and also includes the instance id field7. Ospfv3 requires that every interface has a linklocal address from the range fe8010. Ospfv3 troubleshooting ne40e troubleshooting guide v2.
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