Brocade Communications Systems Layer 3 Routing Configuration ICX 6650 User Manual
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Brocade ICX 6650 Layer 3 Routing Configuration Guide
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Configuring OSPF
Auth-change-wait-time: OSPF gracefully implements authentication changes to allow all routers to
implement the change and thus prevent disruption to neighbor adjacencies. During the
authentication-change interval, both the old and new authentication information is supported. The
default authentication-change interval is 300 seconds (5 minutes). You change the interval to a
value from 0 through 14400 seconds.
Authentication-key: OSPF supports three methods of authentication for each interface—none,
simple password, and MD5. Only one method of authentication can be active on an interface at a
time. The default authentication value is none, meaning no authentication is performed.
The simple password method of authentication requires you to configure an alphanumeric
password on an interface. The simple password setting takes effect immediately. All OSPF packets
transmitted on the interface contain this password. Any OSPF packet received on the interface is
checked for this password. If the password is not present, then the packet is dropped. The
password can be up to eight characters long.
The MD5 method of authentication requires you to configure a key ID and an MD5 Key. The key ID
is a number from 1 through 255 and identifies the MD5 key that is being used. The MD5 key can
be up to sixteen alphanumeric characters long.
Cost: Indicates the overhead required to send a packet across an interface. You can modify the
cost to differentiate between 100 Mbps and 1000 Mbps (1 Gbps) links. The default cost is
calculated by dividing 100 million by the bandwidth. For 10 Mbps links, the cost is 10. The cost for
both 100 Mbps and 1000 Mbps links is 1, because the speed of 1000 Mbps was not in use at the
time the OSPF cost formula was devised.
Dead-interval: Indicates the number of seconds that a neighbor router waits for a hello packet from
the current router before declaring the router down. The value can be from 1 through 65535
seconds. The default is 40 seconds.
Hello-interval: Represents the length of time between the transmission of hello packets. The value
can be from 1 through 65535 seconds. The default is 10 seconds.
MD5-authentication activation wait time: The number of seconds the Layer 3 Switch waits until
placing a new MD5 key into effect. The wait time provides a way to gracefully transition from one
MD5 key to another without disturbing the network. The wait time can be from 0 through 14400
seconds. The default is 300 seconds (5 minutes).
MD5-authentication key ID and key: A method of authentication that requires you to configure a key
ID and an MD5 key. The key ID is a number from 1 through 255 and identifies the MD5 key that is
being used. The MD5 key consists of up to 16 alphanumeric characters. The MD5 is encrypted
and included in each OSPF packet transmitted.
Passive: When you configure an OSPF interface to be passive, that interface does not send or
receive OSPF route updates. By default, all OSPF interfaces are active and thus can send and
receive OSPF route information. Since a passive interface does not send or receive route
information, the interface is in effect a stub network. OSPF interfaces are active by default.
NOTE
This option affects all IP subnets configured on the interface. If you want to disable OSPF updates
only on some of the IP subnets on the interface, use the ospf-ignore or ospf-passive parameter with
the ip address command. Refer to
“Assigning an IP address to an Ethernet port”
Priority: Allows you to modify the priority of an OSPF router. The priority is used when selecting the
designated router (DR) and backup designated routers (BDRs). The value can be from 0 through
255. The default is 1. If you set the priority to 0, the Layer 3 Switch does not participate in DR and
BDR election.