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The Overlapping prefix feature supports Endpoint Identifier (EID) registration by two sites where the EID prefix from one LISP site is a subset of the EID prefix from another LISP site.
An EID value for IPv4 is 32 bit and EID value for IPv6 is 128-bit. EIDs are used in the source and destination address fields of the first LISP header of a packet.
An EID-Prefix is a power-of-two blocks of EIDs allocated to a LISP site by an address allocation authority.
MS and MR functions are implemented on the same device, which is referred to as an MS/MR device.
Configure EID-prefix with "accept-more-specifies" keyword to allow MS to accept registration of more specific prefix.
router lisp site site3 authentication-key cisco eid-prefix 172.16.0.0/8 accept-more-specifics exit
Register 3.0.0.0/8 with MS.
router lisp database-mapping 172.16.0.0/8 10.0.0.3 priority 1 weight 100
Register 3.1.0.0/16 with MS, which is more specific and overlap with 3.0.0.0/8 prefix registered from xTR3.
router lisp database-mapping 192.168.0.0/16 10.0.0.4 priority 1 weight 100 database-mapping 192.0.2.0/8 10.0.0.4 priority 1 weight 100
Perform this task to verify the Overlapping Prefix feature in the LISP network. In this example, there are four routers: MSMR, xTR2, xTR3, and xTR4. Each router has an interface connection in the same subnet (RLOC space) 10.0.0.0/24. The following are the IP addresses of the routers:
|
Router |
IP Address |
|---|---|
|
MSMR |
10.0.0.1 |
|
xTR2 |
10.0.0.2 |
|
xTR3 |
10.0.0.3 |
|
xTR4 |
10.0.0.4 |
MS/MR Output:
Device# show lisp site
LISP Site Registration Information
* = Some locators are down or unreachable
# = Some registrations are sourced by reliable transport
Site Name Last Up Who Last Inst EID Prefix
Register Registered ID
site2 00:15:08 yes# 10.0.0.2 2.0.0.0/8
site3 00:15:05 yes# 10.0.0.3 3.0.0.0/8
00:15:01 yes# 10.0.0.4 3.1.0.0/16
site4 00:15:01 yes# 10.0.0.4 4.0.0.0/8
xTR1 Output:
Device# show ip lisp map-cache LISP IPv4 Mapping Cache for EID-table default (IID 0), 3 entries 0.0.0.0/0, uptime: 00:18:05, expires: never, via static send map-request Negative cache entry, action: send-map-request 3.0.0.0/8, uptime: 00:00:16, expires: 23:59:43, via map-reply, complete Locator Uptime State Pri/Wgt 10.0.0.3 00:00:16 up 1/100 3.1.0.0/16, uptime: 00:00:08, expires: 23:59:51, via map-reply, complete Locator Uptime State Pri/Wgt 10.0.0.4 00:00:08 up 1/100
xTR2 Output:
Device# show ip lisp map-cache LISP IPv4 Mapping Cache for EID-table default (IID 0), 3 entries 0.0.0.0/0, uptime: 00:18:44, expires: never, via static send map-request Negative cache entry, action: send-map-request 2.0.0.0/8, uptime: 00:00:57, expires: 23:59:02, via map-reply, complete Locator Uptime State Pri/Wgt 10.0.0.2 00:00:57 up 1/100 3.1.0.0/16, uptime: 00:18:40, expires: 23:42:12, via map-reply, self, complete Locator Uptime State Pri/Wgt 10.0.0.4 00:17:47 up 1/100 Device# show ip lisp away LISP Away Table for router lisp 0 (default) IID 0 Entries: 1 Prefix Producer 3.1.0.0/16 mapping-notification
xTR3 Output:
Device# show ip lisp map-cache LISP IPv4 Mapping Cache for EID-table default (IID 0), 2 entries 0.0.0.0/0, uptime: 00:19:26, expires: never, via static send map-request Negative cache entry, action: send-map-request 2.0.0.0/8, uptime: 00:01:35, expires: 23:58:24, via map-reply, complete Locator Uptime State Pri/Wgt 10.0.0.2 00:01:35 up 1/100 Device# show ip lisp away LISP Away Table for router lisp 0 (default) IID 0 Entries: 0
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Document Title |
Location |
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Cisco IOS commands |
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LISP commands |
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Standard/RFC |
Title |
|---|---|
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RFC 6830 |
The Locator/ID Separation Protocol (LISP) |
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Description |
Link |
|---|---|
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The Cisco Support and Documentation website provides online resources to download documentation, software, and tools. Use these resources to install and configure the software and to troubleshoot and resolve technical issues with Cisco products and technologies. Access to most tools on the Cisco Support and Documentation website requires a Cisco.com user ID and password. |
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Feature Name |
Releases |
Feature Information |
|---|---|---|
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Overlapping Prefix |
The Overlapping prefix feature supports Endpoint Identifier (EID) registration by two sites where the EID prefix from one LISP site is a subset of the EID prefix from another LISP site. The following commands were modified: authentication-key, database-mapping, router lisp. |
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