H3C S9500 Series Operation Manual

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Operation Manual – MPLSH3C S9500 Series Routing Switches Chapter 3 BGP/MPLS VPN Configuration3-19tag-number is used to identify Tag value; by default, the first two bytes are fixed, that is,0xD000, and the last two bytes is AS number of local BGP. For example, the ASnumber of local BGP is 100, and then its default tag value is 3489661028 in decimalnotation. This value is an integer ranging from 0 to 4294967295.Step 4: Configure Sham-link (optional)Sham-links are required between two PEs when Backdoor links (that is, the OSPF linksthat do not pass through the MPLS backbone network) exist between the two PEs anddata is expected to be transported over the MPLS backbone. A Sham-link between twoPEs is considered as a link in OSPF domain. Its source and destination addresses areboth the Loopback interface address with 32-bit mask, but this Loopback interfaceshould be bound to a VPN instance and direct routes must be imported into BGP byBGP. OSPF processes of the VPN cannot directly import the routes of the Loopbackinterface (so the import direct command cannot be executed in an OSPF processes ofVPN); instead, an OSPF process can only advertise the route indirectly by importing aBGP route.Perform the following configuration in the OSPF area view.Table 3-15 Configure Sham-linkOperation CommandConfigure Sham-linksham-link source-addr destination-addr [ cost cost-value ][ simple password | md5 keyid key ] [ dead seconds ][ hello seconds ] [ retransimit seconds ] [ trans-delayseconds ]Delete a Sham-link undo sham-link source-addr destination-addrBy 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 PEIf you select EBGP between PE and CE, you should configure a neighbor for each VPNin VPN instance address family sub-view, and import IGP route of CE.Step 1: Configure peer groupConfiguring peer group in VPN instance address family view.Table 3-16 Configure peer groupOperation CommandConfigure a peer group group group-name [ internal | external ]Delete the specified peer group undo group group-name