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internet: Document Known Limitations for GlobalRouting

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shashwat
2025-07-17 21:06:47 +05:30
committed by Shashwat Patni
parent 3ff4a45e75
commit 0984797a75
3 changed files with 718 additions and 0 deletions
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3
doc/models/Makefile
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@@ -126,6 +126,7 @@ SOURCEFIGS = \
$(SRC)/internet/doc/internet-node-recv.dia \
$(SRC)/internet/doc/routing.dia \
$(SRC)/internet/doc/routing-specialization.dia \
$(SRC)/internet/doc/global-routing-limitation.dia \
$(SRC)/internet/doc/figures/tcp-state-machine.png \
$(SRC)/internet/doc/figures/dctcp-10ms-50mbps-tcp-throughput.pdf \
$(SRC)/internet/doc/figures/dctcp-10ms-50mbps-tcp-throughput.png \
@@ -394,6 +395,7 @@ IMAGES_EPS = \
$(FIGURES)/internet-node-recv.eps \
$(FIGURES)/routing.eps \
$(FIGURES)/routing-specialization.eps \
$(FIGURES)/global-routing-limitation.eps \
$(FIGURES)/WifiArchitecture.eps \
$(FIGURES)/PhyEntityHierarchy.eps \
$(FIGURES)/WifiPpduHierarchy.eps \
@@ -523,6 +525,7 @@ $(FIGURES)/internet-node-send.pdf_width = 5in
$(FIGURES)/internet-node-recv.pdf_width = 5in
$(FIGURES)/routing.pdf_width = 6in
$(FIGURES)/routing-specialization.pdf_width = 5in
$(FIGURES)/global-routing-limitation.pdf_width = 6in
$(FIGURES)/snir.pdf_width = 3in
$(FIGURES)/lte-interference-test-scenario.pdf_width = 3in
$(FIGURES)/epc-ctrl-arch.pdf_width = 8cm

688
src/internet/doc/global-routing-limitation.dia Normal file
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@@ -0,0 +1,688 @@
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27
src/internet/doc/routing-overview.rst
View File

@@ -285,6 +285,33 @@ Advertisement for each router, and this link state database is
fed into the OSPF shortest path computation logic. The Ipv4 API
is finally used to populate the routes themselves.
Limitations
~~~~~~~~~~~
The following are the known limitations of the GlobalRouting implementation:
#. When calculating routes for networks using GlobalRouting,
if multiple exit Interfaces are present from the root node to a network,
then Packets may travel an extra hop to reach their destination in that network.
Clarifying this further, the following is the generalized conditions:
#. Assume that there is a network (e.g., 10.1.2.0/24) and the network has 2 (or more) routers (2 egress points, or more).
#. Assume that a node has 2 (or more) equal-cost paths toward said network.
#. Assume that multiple IP addresses with that network prefix are present on one or more interfaces.
This will mean that, to reach the internal interfaces of the "other" router(s), the packets will
do one unnecessary hop, passing through the designated router, and discarding the (shorter) path
leading directly to the destination.
.. _Global-Routing-Limitation:
.. figure:: figures/global-routing-limitation.*
#. Although adding Multiple IP addresses on the same interface
and Equal Cost Multi Path are both supported individually,
the combination of both is not fully supported and may lead to unexpected results
and in some specific cases routing loops.
This limitation is tracked in issue #1242 of the issue tracker.
RIP and RIPng
+++++++++++++