Chapter 36 OSPF
XGS4700-48F User’s Guide
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When you configure an OSPF interface, you first set an interface to transmit OSPF
traffic and add the interface to an area.
You can configure a virtual link to establish/maintain connectivity between a non-
backbone area and the backbone. The virtual link must be configured on both
layer-3 devices in the non-backbone area and the backbone.
36.1.4 OSPF and Router Elections
The OSPF protocol provides for automatic election of Designated Router (DR) and
Backup Designated Router (BDR) on network segments. The DR and BDR keep
track of link state updates in their area and make sure LSAs are sent to the rest of
the network.
In most cases the default DR/BDR election is fine, but in some situations it must
be controlled. In the following figure only router A has direct connectivity with all
the other routers on the network segment. Routers B and C do not have a direct
connection with each other. Therefore they should not be allowed to become DR or
BDR. Only router A should become the DR.
Figure 163
OSPF Router Election Example
You can assign a priority to an interface which determines whether this router will
be elected to be a DR or BDR. The router with the highest priority becomes the
DR, while a router with a priority of 0 does not participate in router elections. In
you can assign a priority of 0 to routers B and C, thereby
ensuring they do not become DR or BDR and assign a priority of 1 to router A to
make sure that it does become the DR.
36.1.5 Configuring OSPF
To configure OSPF on the Switch, do the following tasks:
1
Enable OSPF
Summary of Contents for XGS4700 Series
Page 2: ......
Page 8: ...Safety Warnings XGS4700 48F User s Guide 8...
Page 24: ...Table of Contents XGS4700 48F User s Guide 24...
Page 25: ...25 PART I User s Guide...
Page 26: ...26...
Page 32: ...Chapter 1 Getting to Know Your Switch XGS4700 48F User s Guide 32...
Page 54: ...Chapter 3 Hardware Overview XGS4700 48F User s Guide 54...
Page 97: ...97 PART II Technical Reference...
Page 98: ...98...
Page 104: ...Chapter 7 System Status and Port Statistics XGS4700 48F User s Guide 104...
Page 118: ...Chapter 8 Basic Setting XGS4700 48F User s Guide 118...
Page 138: ...Chapter 9 VLAN XGS4700 48F User s Guide 138...
Page 142: ...Chapter 10 Static MAC Forward Setup XGS4700 48F User s Guide 142...
Page 174: ...Chapter 14 Bandwidth Control XGS4700 48F User s Guide 174...
Page 188: ...Chapter 17 Link Aggregation XGS4700 48F User s Guide 188...
Page 198: ...Chapter 18 Port Authentication XGS4700 48F User s Guide 198...
Page 216: ...Chapter 21 Policy Rule XGS4700 48F User s Guide 216...
Page 260: ...Chapter 25 AAA XGS4700 48F User s Guide 260...
Page 284: ...Chapter 26 IP Source Guard XGS4700 48F User s Guide 284...
Page 316: ...Chapter 32 Error Disable XGS4700 48F User s Guide 316...
Page 320: ...Chapter 33 Static Route XGS4700 48F User s Guide 320...
Page 328: ...Chapter 35 RIP XGS4700 48F User s Guide 328...
Page 384: ...Chapter 42 ARP Learning XGS4700 48F User s Guide 384...
Page 420: ...Chapter 45 Access Control XGS4700 48F User s Guide 420...
Page 426: ...Chapter 47 Syslog XGS4700 48F User s Guide 426...
Page 434: ...Chapter 48 Cluster Management XGS4700 48F User s Guide 434...
Page 438: ...Chapter 49 MAC Table XGS4700 48F User s Guide 438...
Page 442: ...Chapter 50 IP Table XGS4700 48F User s Guide 442...
Page 446: ...Chapter 52 Routing Table XGS4700 48F User s Guide 446...
Page 454: ...Chapter 54 Troubleshooting XGS4700 48F User s Guide 454...
Page 464: ...Chapter 55 Product Specifications XGS4700 48F User s Guide 464...
Page 473: ...Appendix B Legal Information XGS4700 48F User s Guide 473...
Page 474: ...Appendix B Legal Information XGS4700 48F User s Guide 474...