IP Routing: LISP Configuration Guide, Cisco IOS XE Gibraltar 16.11.x
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The LISP Generalized SMR feature enables LISP xTR (ITR and ETR) to
update map cache when there is a change in database mapping.
Note
There is no configuration commands for this feature. This feature is
turned on automatically.
Information About LISP Generalized SMR
Solicit-Map-Request (SMR)
Soliciting a Map-Request enables ETRs to control requests for Map-Reply
messages when there is change in database mapping. SMRs enable remote ITRs to
update the database mappings that are cached. An SMR message is simply a bit
set in a Map-Request message. An ITR or PITR will send a Map-Request when they
receive an SMR message.
Note
There is no configuration commands for this feature. This feature is
turned on automatically.
Generalized SMR
(GSMR)
SMR was mainly used
to support LISP mobility. This mechanism has been generalized (Generalized
Solicit Map Request - GSMR) to support the following use cases:
De-configured local EID
Local EID no-route (when an ETR decapsulates a data packet and finds
no route for a configured local EID)
Mobility host move out and detection
Overlapping prefix
Note
There are no
configuration commands for this feature. This feature is turned on
automatically.
Verifying LISP
Generalized SMR
Perform this task
to verify the LISP Generalized SMR feature which is enabled automatically in
the LISP network. In this example, a LISP site uses a single edge router that
functions as both ITR and ETR (known as an xTR). Routing Locators (RLOCs) are
in IPv4. EID prefixes are in both IPv4 and IPv6. The LISP site registers to two
map server/map resolver (MSMR) devices in the network core. The topology used
in verifying LISP Generalized SMR is as shown in the figure below.
The components as
shown in the topology are described below:
xTR1 and xTR2 are xTRs for
2 LISP sites.
Core1 and Core 2 are
routing locators (RLOCs) core routers with no LISP configuration.
New MSMR is a map-server
and map-resolver with reliable map-registration support, whereas Old MSMR does
not support reliable map-registration.
PxTR1 works as a Proxy
Ingress Tunnel Router (PITR) and Proxy Egress Tunnel Router (PETR) between the
network with 10.0.0.0/8 prefix and the LISP sites.
Only static routing
protocols are used in this setup to reduce control traffic.
Verifying 172.16.0.0/24 is
in map cache on xTR2:
Device# show ip lisp map-cache
LISP IPv4 Mapping Cache for EID-table default (IID 0), 3 entries
0.0.0.0/0, uptime: 03:32:45, expires: never, via static send map-request
Negative cache entry, action: send-map-request
10.20.20.0/24, uptime: 00:00:05, expires: 23:59:54, via map-reply, complete
Locator Uptime State Pri/Wgt
203.0.113.11 00:00:05 up 1/100
172.16.0.0/24, uptime: 00:35:49, expires: 23:24:10, via map-reply, complete
Locator Uptime State Pri/Wgt
203.0.113.11 00:35:49 up 1/100
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The following table provides release information about the feature or features described in this module. This table lists
only the software release that introduced support for a given feature in a given software release train. Unless noted otherwise,
subsequent releases of that software release train also support that feature.
Use Cisco Feature Navigator to find information about platform support and Cisco software image support. To access Cisco
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Table 1. Feature
Information for LISP Generalized SMR
Feature Name
Releases
Feature
Information
LISP
Generalized SMR
The LISP
Generalize SMR feature supports LISP mobility, de-configured local Endpoint
Identifier (EID), local EID no-route, overlapping prefix support, and mobility
host move out and detection.
The
following commands were modified:
show ip lisp
away ,
show ip lisp
data ,
show ip lisp
map-cache .