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For routing purposes, the internet is divided into ASs (Autonomous Systems). Data is routed within an AS by using an IGP (Interior Gateway Protocol) and between different ASs by using an EGP (Exterior Gateway Protocol). BloxOne The Infoblox Platform supports OSPFv2 (for IPv4) for a routing IGP, and it supports BGP4 to advertise anycast addresses in the larger internetwork.
To configure anycast
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To configure anycast service settings, specify the following:
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NAME/ANYCAST IP ADDRESS: All anycast addresses you have configured. Choose an anycast name or address from the drop-down list.
DESCRIPTION: The description given to the anycast address.
SERVICE: The configured service associated with the anycast address.
OSPFV2: An indication of whether OSPFV2 (if it is configured) is to be used as the routing protocol for the IPv4 anycast address. Select this checkbox if you want to use OSPFV2.
BGP: An indication of whether BGP (if it is configured) is to be used as the routing protocol for the IPv4 anycast address. Select this checkbox if you want to use BGP.
OSPFv2 Configuration
BloxOne Infoblox Platform supports OSPFv2 for IPv4 anycast addressing. Click Add and specify the following:
Area Type: From the drop-down list, choose the type of an OSPF area to be associated with the advertising interface. The area type configured here must match the area type of the upstream router’s configuration. Choose one of the following supported area types:
NSSA (Not-so-stubby Area): An NSSA imports AS external routes and sends them to the backbone, but it cannot receive AS external routes from the backbone or other areas.
Standard: A standard area has no restrictions on routing advertisements. It connects to the backbone area (Area 0) and accepts both internal and external link-state advertisements.
Stub: A stub area is an area that does not receive external routes.
Area ID: Enter the OSPF area ID of the network that contains the upstream routers. All network devices configured with the same OSPF area ID belong to the same OSPF area. You can enter the ID in a dotted decimal format similar to an IP address, such as 192.168. 17.33. You can also enter the ID as a decimal equivalent; for example, Area 261 is same as Area 0.0.
Advertising Interface: Enter the interface that sends out OSPF advertisements.
Authentication Type: Choose the method to be used to authenticate OSPF advertisements on the interface. The authentication type configured here must match the authentication type of the upstream router’s configuration. Choose one of the following supported authentication types:
Clear: A simple clear-text password will be used to authenticate OSPF advertisements.
MD5: An MD5 hash algorithm will be used to authenticate OSPF advertisements. This is the most secure option.
Key: Enter the key identifier to be used to specify the correct hash algorithm after you select MD5 as your OSPF authentication type. The authentication key ID configured here must match the authentication key ID of the upstream router’s configuration.
Cost: Specify a value that will determine the cost associated with the OSPF advertisement interface. Use the up and down arrows, or enter a value manually. You can calculate the cost as 100,000,000 (the reference bandwidth) divided by the interface bandwidth. For example, a 100-MB interface has a cost of 1, and a 10-MB interface has a cost of 10.
Hello Interval(s): Specify how often (in seconds) OSPF hello advertisements are to be sent from the advertisement interface. Use the up or down arrow, or manually enter a number from 1 to 65,535; the default value is 10. The hello interval configured here must match the hello interval of the upstream router’s configuration.
Dead interval(s): Specify how long (in seconds) the interface is to wait before declaring the host NIOS-X server as unavailable and down. Use the up and down arrows, or manually enter a number from 1 to 65,535; the default value is 40. The dead interval configured here must match the dead interval of the upstream router’s configuration.
Retransmit Interval(s): Specify how long (in seconds) the interface is to wait before retransmitting OSPF advertisements from the interface. Use the up and down arrows, or manually enter a number from 1 to 65,535; the default value is 5. The retransmit interval configured here must match the retransmit interval of the upstream router’s configuration.
Transmit Delay(s): Specify how long (in seconds) the interface is to wait before sending an advertisement from the interface. Use the up and down arrows, or manually enter a number from 1 to 65,535; the default value is 1 second. The transmit interval configured here must match the transmit interval of the upstream router’s configuration.
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ASN: Specify the ASN (autonomous system number) of the interface. Use the up and down arrows, or manually enter a value from 1 to 4294967295. BGP uses the unique ASN to identify each system. BloxOne The Infoblox Platform supports up to four-byte ASNs, including ASPLAIN and ASDOT formats.
BGP Timers: BGP uses timers to control how often the interface is to send keepalive messages and how long it is to wait before declaring a neighboring router out of service. The keepalive timer determines the time interval at which the interface sends keepalive messages to a neighboring router to inform the neighbor that the appliance is alive. The hold down timer determines how long the interface is to wait for a keepalive or an UPDATE message before it assumes its neighboring router is out of service. If the neighbor is down, the interface terminates the BGP session and withdraws all the BGP routing information it is about to send to the neighbor.
Keep Alive: Specify the time interval (in seconds) during which the interface will send keepalive messages. Use the up and down arrows, or manually enter a value from 1 to 21845 seconds; the default is 4.
Hold Down: Specify the time (in seconds) that the interface is to wait for a keepalive message from its neighbor before declaring the neighbor out of service. Use the up and down arrows, or manually enter a value from 3 to 65535 seconds; the default is 16.
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Neighbor Router: Enter the IP address (IPv4 or IPv6) of the neighboring BGP router. The neighboring router can be within the same AS (the most likely case) or from a router in an external AS.
Remote ASN: Specify the ASN of the neighboring router. Use the up and down arrows, or manually enter an ASN number from 1 to 4294967295. BloxOne The Infoblox Platform supports up to four-byte ASNs, including ASPLAIN and ASDOT formats.
Password: Enter the authentication password that the NIOS appliance will use to connect to the BGP neighbor. You can enter up to 80 printable ASCII characters. The password configured on the Grid member must match the password of the BGP neighbor.
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Enable Multihop: Select this checkbox to allow BGP to connect with the neighbors that are more than one IP hop away.
Hop Limit: If multihop is enabled, enter the maximum hop limit. The default value is 255.
Click Next to view the Anycast Configuration Summary.