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ME60 V800R010C10SPC500 Feature Description - WAN Access 01

This is ME60 V800R010C10SPC500 Feature Description - WAN Access
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Application Scenarios for XPL

Application Scenarios for XPL

Using XPL to Filter Routes

On the network shown in Figure 11-2, Device A has routes to 172.1.16.0/24, 172.1.17.0/24, and 172.1.18.0/24. The networking requirements are as follows:

  • Device A advertises only route 172.1.17.0/24 to Device B.

  • After receiving the route from Device B, Device C forwards it directly to Device E, and Device D increases the MED attribute of the route before forwarding it to Device E to ensure that Device C functions as the egress for the traffic from Device E to 172.1.17.0/24.

Figure 11-2 Route filtering scenario

The preceding requirements can be met using an IPv4 prefix set:
  1. Configure an IPv4 prefix set named ip-prefix1, which includes only the 172.1.17.0 24 element, on Device A.
  2. Configure a route-filter named route-filter1 on Device A, which permits the route carrying the element in ip-prefix1 and denies other routes.
  3. Configure route-filter1 as an export policy on Device A so that Device A advertises only route 172.1.17.0/24 to Device B.
  4. Configure an IPv4 prefix set named ip-prefix2, which includes only 172.1.17.0 24, on Device D.
  5. Configure a route-filter named route-filter2, which increases the MED value of the route carrying the element in ip-prefix2, on Device D.
  6. Configure route-filter2 as an export policy on Device D so that the MED value of the route advertised by Device D is greater than that of the route advertised by Device C, making Device C the egress for the traffic from Device E to 172.1.17.0/24.
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Updated: 2019-01-04

Document ID: EDOC1100059473

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