3com S7906E Guide De Référence

 

1-50 

Use the undo ospf mtu-enable command to restore the default. 

By default, an interface adds a MTU of 0 into DD packets, that is, no real MTU is added. 

Note that: 

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After a virtual link is established via a Tunnel, two devices on the link from different vendors may 

have different MTU values. To make them consistent, set the attached interfaces’ default MTU to 0.  

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This configuration is not supported on the null interface. 

# Enable the interface to add the real MTU value into DD packets. 

<Sysname> system-view 

[Sysname] interface vlan-interface 10 

[Sysname-Vlan-interface10] ospf mtu-enable 

ospf network-type { broadcast | nbma | p2mp | p2p } 

Interface view 

2: System level 

broadcast: Specifies the network type as Broadcast. 

nbma: Specifies the network type as NBMA. 

p2mp: Specifies the network type as P2MP. 

p2p: Specifies the network type as P2P. 

Use the ospf network-type command to set the network type for an interface.  

Use the undo ospf network-type command to restore the default network type for an interface. 

By default, the network type of an interface depends on its link layer protocol.  

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For Ethernet, and FDDI, the default network type is broadcast. 

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For ATM, FR, and X.25, the default network type is NBMA. 

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For PPP, LAPB, HDLC, and POS, the default network type is P2P. 

Note that: 

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If a router on a broadcast network does not support multicast, you can configure the interface’s 

network type as NBMA. 

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If any two routers on an NBMA network are directly connected via a virtual link, that is, the network 

is fully meshed, you can configure the network type as NBMA; otherwise you need to configure it as 

P2MP for two routers having no direct link to exchange routing information via another router.