Troubleshooting guide

Example Configurations
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outbound to both ISPs. This prefix will prevent any routes learned by the AOS device using BGP from one
ISP from being advertised to the other ISP. If default routes are only learned from the ISPs, then the
potential of becoming a transit AS is not an issue. However, it is good practice to use outbound prefixes as
a preventative measure for multihoming setups.
G2
G3
G4
NetVanta 1234
7
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
G1
G2
G3
G4
1
3
5
9
11
13
15
2
4
6
8
10
12
14
16
17
19
21
23
18
20
22
24
STAT
G1
Internet
AS 65000
AS 65001
AS 65002
T1
ISP 1
ISP 2
eth 0/1
PPP 1
65.162.109.201 /30
208.61.209.1 /29
(Public Block)
208.61.209.254 /30
208.61.209.253 /30
65.162.109.202 /30
T1
PPP 2
Figure 7. Load Balancing Across Multihomed Connections to Two ISPs
The following configuration applies to Example 5:
!
ip load-sharing per-destination
!
interface eth 0/1
ip address 208.61.209.1 255.255.255.248
no shutdown
!
interface t1 1/1
clock source line
tdm-group 1 timeslots 1-24 speed 64
no shutdown
!
interface t1 2/1
clock source line
tdm-group 1 timeslots 1-24 speed 64
no shutdown
!
interface ppp 1
ip address 208.61.209.254 255.255.255.252
no shutdown
cross-connect 1 t1 1/1 1 ppp 1
!