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Route Preferences Configuration

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Adding a Router Route 1. Open the Configured Routes page. 2. Click Add. The Router Route Entry Configuration page displays, as Figure 9-38 shows. 3. Next to Route Type, use the drop-down box to add a Default route or a Static route. Default - Enter the default gateway address in the Next Hop IP Address field. Figure 9-38 shows the fields that display when the Route Type value is Default. Static - Enter values for Network Address, Subnet Mask, Next Hop IP Address, and Preference. Figure 9-39 shows the fields that display when the Route Type value is Static. 4. Click Apply Changes. The new route is added, and you are returned to the Configured Routes page. Displaying Configured Routes using the CLI Command For information about the CLI command that performs this function, see the following chapter in the CLI Reference Guide: • IP Routing Commands Route Preferences Configuration Use the Router Route Preferences Configuration page to configure the default preference for each protocol (for example 60 for static routes). These values are arbitrary values that range from 1 to 255, and are independent of route metrics. Most routing protocols use a route metric to determine the shortest path known to the protocol, independent of any other protocol. The best route to a destination is chosen by selecting the route with the lowest preference value. When there are multiple routes to a destination, the preference values are used to determine the preferred route. If there is still a tie, the route with the best route metric is chosen. To avoid problems with mismatched metrics (i.e. RIP and OSPF metrics are not directly comparable), you must configure different preference values for each of the protocols. Static Reject Routes A static reject route is a static route to discard the packets to a particular destination, thereby forcing a black-hole routing behavior for a particular set of IP prefixes. Static reject routes can help prevent a routing loop in the network if a default route is configured on a router. Static reject routes also help protect against a DOS attack on a router with unwanted destination addresses. NOTE: Static reject routes are not redistributed by OSPF or RIP. Configuring Routing 529

Section	Page
User’s Guide	1
Introduction	17
Switching Features	20
Port-Based Features	22
Spanning Tree Protocol Features	25
IPv6	30
OSPFv3	31
Quality of Service Features	31
Multicast Features	32
CLI Documentation	34
Using Dell™ OpenManage™ Switch Administrator	35
Understanding the Interface	37
Check Boxes	43
Defining Fields	43
Accessing the Switch Through the CLI	43
Console Connection	44
Using the CLI	44
Cable and Port Information	47
Overview	47
Power Connection	50
Hardware Description	51
Overview	51
PowerConnect Front Panel	52
Console (RS-232) Port	55
Configuring Dell™ PowerConnect™	65
Overview	65
Starting the CLI	66
General Configuration Information	68
Baud Rate	68
Booting the Switch	69
Configuration Overview	75
Advanced Configuration	80
Boot Menu Functions	89
Delete Backup Image	93
Activate Backup Image	94
Sample Configuration Process	95
Switch Setup Requirements	95
Configuring System Information	105
Overview	105
Managing Logs	124
Setting the Operational Mode	132
Defining IP Addressing	134
Out of Band Interface	135
Running Cable Diagnostics	145
Managing Device Security	149
Captive Portal	188
Defining SNMP Parameters	209
File Management	231
Defining Advanced Settings	238
Defining Stacking	240
sFlow	247
Industry Standard Discovery Protocol	255
Configuring Switching Information	261
Overview	261
Configuring Ports	287
Configuring Traffic Mirroring	298
Configuring Address Tables	302
Configuring GARP	307
Configuring the Spanning Tree Protocol	310
Configuring VLANs	324
Configuring Voice VLAN	347
Aggregating Ports	349
Managing Multicast Support	355
IGMP Snooping	362
MRouter Status	371
MLD Snooping	372
Configuring the Link Layer Discovery Protocol (LLDP)	379
Creating Link Dependencies	386
Dynamic ARP Inspection	389
DHCP Snooping	397
DHCP Relay	410
Using the Port Aggregator Feature	416
Viewing Statistics and Remote Monitoring	423
Overview	423
Table Views	424
RMON	433
Charts	448
Configuring Routing	453
Overview	453
IP	458
OSPF	465
BOOTP/DHCP Relay Agent	499
IP Helper	502
RIP	509
Router Discovery	520
Router	523
VLAN Routing	533
VRRP	536
Tunnels	546
Loopbacks	551
Configuring IPv6	559
Overview	559
Global Configuration	560
Interface Configuration	561
Interface Summary	564
IPv6 Statistics	565
IPv6 Neighbor Table	570
DHCPv6	571
OSPFv3	586
IPv6 Routes	616
Configuring Quality of Service	623
Quality of Service Overview	623
Configuring Differentiated Services	624
Class of Service	641
Auto VoIP	650
Configuring IP Multicast	653
Overview	653
Multicast Listener Discovery	666
Distance Vector Multicast Routing Protocol	679
Internet Group Management Protocol	688
Protocol Independent Multicast-Dense Mode	703
Protocol Independent Multicast-Sparse Mode	716
Getting Help	731
Dell Enterprise Training and Certification	733
Problems With Your Order	733
Product Information	734
Returning Items for Warranty Repair or Credit	734
Before You Call	734

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Configuring Routing

529

Adding a Router Route

Open the

Configured Routes

page.

Click

Add

The

Router Route Entry Configuration

page displays, as Figure 9-38 shows.

Next to

Route Type,

use the drop-down box to add a

Default

route or a

Static

route.

Default

— Enter the default gateway address in the

Next Hop IP Address

field. Figure 9-38 shows the

fields that display when the

Route Type

value is Default.

Static

— Enter values for

Network Address

Subnet Mask

Next Hop IP Address

, and

Preference

Figure 9-39 shows the fields that display when the

Route Type

value is Static.

Click

Apply Changes

The new route is added, and you are returned to the Configured Routes page.

Displaying Configured Routes using the CLI Command

For information about the CLI command that performs this function, see the following chapter in the

CLI Reference Guide:

•

IP Routing Commands

Route Preferences Configuration

Use the

Router Route Preferences Configuration

page to configure the default preference for each

protocol (for example 60 for static routes). These values are arbitrary values that range from 1 to 255, and

are independent of route metrics. Most routing protocols use a route metric to determine the shortest

path known to the protocol, independent of any other protocol.

The best route to a destination is chosen by selecting the route with the lowest preference value. When

there are multiple routes to a destination, the preference values are used to determine the preferred

route. If there is still a tie, the route with the best route metric is chosen. To avoid problems with

mismatched metrics (i.e. RIP and OSPF metrics are not directly comparable), you must configure

different preference values for each of the protocols.

Static Reject Routes

A static reject route is a static route to discard the packets to a particular destination, thereby forcing a

black-hole routing behavior for a particular set of IP prefixes. Static reject routes can help prevent a

routing loop in the network if a default route is configured on a router. Static reject routes also help

protect against a DOS attack on a router with unwanted destination addresses.

NOTE:

Static reject routes are not redistributed by OSPF or RIP.