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3Com Switch 8800 Configuration Guide Chapter 37 BGP/MPLS VPN Configuration
37-20
Table 37-19 Configure sham link
Operation Command
Configure sham link
sham-link source-addr destination-addr [ cost cost-value ]
[ simple password | md5 keyid key ] [ dead seconds ]
[ hello seconds ] [ retransimit seconds ] [ trans-delay
seconds ]
Delete a sham link
undo sham-link source-addr destination-addr
By default, the cost value is 1, dead value is 40 seconds, hello value is 10 seconds,
retransmit value is 5 seconds and trans-delay value is 1 second.
4) Configure EBGP on PE
If you select EBGP between PE and CE, you should configure a neighbor for each VPN
in VPN instance address family sub-view, and import IGP route of CE.
Step 1: Configure peer group
Configuring peer group in VPN instance address family view.
Table 37-20 Configure peer group
Operation Command
Configure a peer group
group group-name [ internal | external ]
Delete the specified peer group
undo group group-name
By default, the peer group is configured as internal. When BGP mode is used for
PE-CE route switching, they often belong to different ASs, so you should configure
EBGP peer as external.
Step 2: Configure AS number for a specific neighbor and add group member to a peer
group
When EBGP mode is used for PE-CE route switching, you should configure AS number
for a specific neighbor for every CE VPN-instance.
Perform the following configuration in VPN instance address family view.
Table 37-21 Configure AS number for a specific neighbor
Operation Command
Configure AS number for
a specific neighbor
peer { group-name | [ peer-address group
group-name ] } as-number as-number
Delete the AS number of a
specific neighbor
undo peer { group-name | [peer-address group
group-name ] } as-number as-number]
Step 3: Activate peer (group)