3com S7906E Manuel De Montage

 

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The route 9.1.1.0/24 has two next hops 3.1.1.1 and 3.1.2.1, both of which are marked with a 

greater-than sign (>), indicating they are the best routes. 

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Using the display ip routing-table command, you can find two routes to 9.1.1.0/24: one with next 

hop 3.1.1.1 and outbound interface VLAN-interface 200, the other with next hop 3.1.2.1 and 

outbound interface VLAN-interface 300.  

As shown in the following figure, Switch B establishes eBGP connections with Switch A and C. 

Configure No_Export community attribute on Switch A to make routes from AS 10 not advertised by AS 

20 to any other AS. 

Figure 1-23 Network diagram for BGP community configuration 

 

 

1)  Configure IP addresses for interfaces (omitted) 

2) Configure 

eBGP 

# Configure Switch A. 

<SwitchA> system-view 

[SwitchA] bgp 10 

[SwitchA-bgp] router-id 1.1.1.1 

[SwitchA-bgp] peer 200.1.2.2 as-number 20 

[SwitchA-bgp] network 9.1.1.0 255.255.255.0 

[SwitchA-bgp] quit 

# Configure Switch B. 

<SwitchB> system-view 

[SwitchB] bgp 20 

[SwitchB-bgp] router-id 2.2.2.2 

[SwitchB-bgp] peer 200.1.2.1 as-number 10 

[SwitchB-bgp] peer 200.1.3.2 as-number 30 

[SwitchB-bgp] quit 

# Configure Switch C. 

<SwitchC> system-view 

[SwitchC] bgp 30 

[SwitchC-bgp] router-id 3.3.3.3