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View Full Version : [?] Checking ARP tables in NSN RNC



pUbLIS
2013-11-12, 01:58 AM
Hi guys,

Does anyone knows how can I check ARP tables on a NSN RNC (RU30)?

Thanks in advance.
Regards

djordjebeg
2013-11-12, 10:50 PM
Hi,

If you mean ARP THP maping to SPI it is in RNPS object ( PriForIntTHP1ARP1....).
regards,

qarmates
2013-11-13, 06:28 AM
Hi,

tks for the response djordjeberg
What do you mean about arp table?
this is Proxy ARP in BTS?

qarmates
2013-11-13, 06:50 AM
if its Proxy ARP in BTS, this is RAN2083 Proxy ARP in BTS.

RAN2083: ProxyARP in BTS


Introduction to the feature
This feature introduces the ProxyARP at the BTS external IP/Ethernet interfaces. With the feature, the BTS replies with its own external interface MAC address to the ARP requests for IP application addresses from the BTS internal O&M subnet.

Benefits
End-user benefits
This feature does not affect the end user experience.

Operator benefits
Using ProxyARP saves effort in terms of route configuration in site routers (for L3 deployments) or RNC's units (for L2 deployments). Thus it allows simpler, less error-prone, and faster (re-)commissioning.
The feature decreases the complexity in planning, configuring, and maintaining the packet based radio access network and thus increases serviceability and saves OPEX.


Requirements
Software requirements



RAS

Flexi Direct

IPA-RNC

mcRNC

OMS

BTS Ultra

BTS Flexi



Release

RU30 EP1

Support not required

Support not required

Support not required

Support not required

Not planned

WN7.0 1.0






AXC

NetAct

MSC

SGSN

MGW

UE



Release

Not planned

OSS5.3 MP1/MP2 and OSS5.4 CD Set 1

Support not required

Support not required

Support not required

Support not required





Table:
Software requirements




Hardware requirements
In Flexi WCDMA BTS this feature requires transport sub-module with Ethernet interface.


Functional description
With the RAN2083: ProxyARP in BTS feature, the BTS replies to ARP requests for list of IP addresses from the internal O&M subnet as well as application IP addresses, with its external interface MAC address, provided it can route packets to those IP addresses. This ensures that a far-end device can reach an IP address, which is not located on the connected BTS physical interface, without having to add a next-hop configuration. This allows direct access to the management plane subnet and Site Support Equipment (SSE) addresses without a need for having static routes configured in the site router or RNC units (depending on the L2/L3 deployment). In general this means that Ethernet frames targeted for the internal BTS subnet, sent to the MAC address of the external Ethernet interface are routed by the BTS.
https://online.portal.nokiasiemensnetworks.com/pic/nedproxy/NED?action=retrieve&source=xdoc&library=a25003a0000b5241476p1&item=docs/fd_ru30_feature_descriptions/g15.16=ran2083/public/proxy_arp_uc1.pnghttps://online.portal.nokiasiemensnetworks.com/pic/nedproxy/NED?action=retrieve&source=xdoc&library=a25003a0000b5241476p1&item=images/zoom-in.png


Figure 42:
ProxyARP in BTS basic scenario (transport and O&M supernet)


The operator can configure exactly one list with up to 16 IP addresses per Ethernet port or VLAN interface. The BTS then replies to the ARP requests only for the IP addresses from that list. Having at least one entry in the list enables the feature.
The ARP replies for the IP addresses from the ProxyARP list are built in the same way as for the IP address of the Ethernet port. The usual ARP functionality is not affected by this feature.
Transport and O&M Supernet
In the example configuration presented in the figure ProxyARP in BTS basic scenario (transport and O&M supernet), the transport (C/U plane) and O&M subnets are included into a supernet. Without ProxyARP, a route is required to reach the O&M subnet via the C/U plane address in the next-hop router. The IP addresses from both the transport and the O&M subnet appear to be directly connected to the router. No dedicated routing entry for the O&M subnet is needed. The router tries to directly send IP packets to 10.1.4.1 and 10.1.4.2 to this host, therefore it needs a MAC address, which the BTS provides via the proxyARP functionality.
O&M Supernet on Separate VLAN
In this configuration, the O&M subnets of several BTSs are combined in an O&M supernet. This O&M supernet and the U/C IP addresses in the corresponding transport subnets are separate subnets and are mapped to different VLANs. Hence U/C and M-plane traffic are separated. As a downside, the U/C IP addresses cannot be used anymore as gateways for the O&M traffic.
In this use case, proxyARP is used to make the IP addresses in the BTS subnets to appear directly connected to the router.
https://online.portal.nokiasiemensnetworks.com/pic/nedproxy/NED?action=retrieve&source=xdoc&library=a25003a0000b5241476p1&item=docs/fd_ru30_feature_descriptions/g15.16=ran2083/public/proxy_arp_uc2.pnghttps://online.portal.nokiasiemensnetworks.com/pic/nedproxy/NED?action=retrieve&source=xdoc&library=a25003a0000b5241476p1&item=images/zoom-in.png


Figure 43:
ProxyARP in BTS with O&M supernet on separate VLAN




System impact
Interdependencies between features
This feature requires one of the following features:


RAN74: IP Based Iub for Flexi WCDMA BTS

RAN1449: Dual Iub for Flexi WCDMA BTS



Impact on interfaces
This feature has no impact on interfaces.

Impact on network and network element management tools
Enabling ProxyARP on BTSs facilitates the network management in the sense that additional routes towards O&M networks do not have to be configured (manually or dynamically) in the router. These networks are seen on the router as directly connected.

Impact on system performance and capacity
The overall amount of ARP messages sent to and by a BTS increases. There are ARP messages for each IP address used by the BTS instead of only the U/C plane addresses. This increase in the amount of ARP messages has to be considered when determining the maximal number of BTSs that can be connected to a network.


RAN2083: ProxyARP in BTS management data
For information on alarm, counter, key performance indicator, and parameter documents, see Reference documentation.

Alarms
There are no alarms related to this feature.

Measurements and counters
There are no measurements and counters related to this feature.

Key performance indicators
There are no key performance indicators related to this feature.

Parameters
Table New parameters lists parameters introduced with this feature.


Full name

Abbreviated name

Managed object



List of proxy ARP IP addresses for this interface.

proxyArpIpAddrList

IEIF



List of proxy ARP IP addresses for this interface.

proxyArpIpAddrList

IVIF





Table:
New parameters





Sales information


BSW/ASW

SW component

License control in network element



BSW

RAN

-





Table:
Sales information







Activation Proxy ARP in BTS

https://online.portal.nokiasiemensnetworks.com/pic/nedproxy/NED?action=retrieve&source=xdoc&library=a25003a0000b5241476p1&item=images/top-about-ned.gif Activating RAN2083: ProxyARP in BTS
Activating RAN2083: ProxyARP in BTS
Follow this procedure to activate the feature RAN2083: ProxyARP in BTS.
For more information on the feature, see the RAN2083: ProxyARP in BTS feature description.

Before you start
The feature RAN2083: ProxyARP in BTS belongs to the basic software and does not require a licence. To enable the RAN2083: ProxyARP in BTS feature, enter at least one IP address in the static ARP table, which is responsible for the ProxyARP functionality.
IP over Ethernet has to be available at the BTS site for RAN2083: ProxyARP in BTS to be operational; therefore one of the following features is required as a prerequisite:


RAN74: IP Based Iub for Flexi WCDMA BTS

RAN1449: Dual Iub for Flexi WCDMA BTS



Steps
https://online.portal.nokiasiemensnetworks.com/pic/nedproxy/NED?action=retrieve&source=xdoc&library=a25003a0000b5241476p1&item=images/add.gif


https://online.portal.nokiasiemensnetworks.com/pic/nedproxy/NED?action=retrieve&source=xdoc&library=a25003a0000b5241476p1&item=images/groupline.png


1.



Open the BTS Site Manager.

https://online.portal.nokiasiemensnetworks.com/pic/nedproxy/NED?action=retrieve&source=xdoc&library=a25003a0000b5241476p1&item=images/zoom-in.png







https://online.portal.nokiasiemensnetworks.com/pic/nedproxy/NED?action=retrieve&source=xdoc&library=a25003a0000b5241476p1&item=images/groupline.png


1



Open the BTS Site Manager.








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2.



Configure the transport and BTS IP addresses.


https://online.portal.nokiasiemensnetworks.com/pic/nedproxy/NED?action=retrieve&source=xdoc&library=a25003a0000b5241476p1&item=images/zoom-in.png








https://online.portal.nokiasiemensnetworks.com/pic/nedproxy/NED?action=retrieve&source=xdoc&library=a25003a0000b5241476p1&item=images/groupline.png


2



Configure the transport and BTS IP addresses.



In IP view, choose the IP Addresses tab.
In the TRS and BTS fields, enter the required IP addresses.









https://online.portal.nokiasiemensnetworks.com/pic/nedproxy/NED?action=retrieve&source=xdoc&library=a25003a0000b5241476p1&item=images/collapsed-close.png





https://online.portal.nokiasiemensnetworks.com/pic/nedproxy/NED?action=retrieve&source=xdoc&library=a25003a0000b5241476p1&item=images/groupline.png


3.



Configure the IP interfaces.

https://online.portal.nokiasiemensnetworks.com/pic/nedproxy/NED?action=retrieve&source=xdoc&library=a25003a0000b5241476p1&item=images/zoom-in.png







https://online.portal.nokiasiemensnetworks.com/pic/nedproxy/NED?action=retrieve&source=xdoc&library=a25003a0000b5241476p1&item=images/groupline.png


3



Configure the IP interfaces.



In IP view, choose the IP Interfaces tab. From the side menu, choose the desired IP interface: Ethernet or VLAN, for which the ProxyARP is to be enabled.









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https://online.portal.nokiasiemensnetworks.com/pic/nedproxy/NED?action=retrieve&source=xdoc&library=a25003a0000b5241476p1&item=images/groupline.png


4.



Fill in the ProxyARP list.

https://online.portal.nokiasiemensnetworks.com/pic/nedproxy/NED?action=retrieve&source=xdoc&library=a25003a0000b5241476p1&item=images/zoom-in.png







https://online.portal.nokiasiemensnetworks.com/pic/nedproxy/NED?action=retrieve&source=xdoc&library=a25003a0000b5241476p1&item=images/groupline.png


4



Fill in the ProxyARP list.



The ProxyARP button is located below the IP interface configuration menu. Once selected, a new window opens.
Fill in the ProxyARP list with up to 16 IP addresses per IP interface. Any IP address can be added to a list, with the following exceptions:


0.0.0.0

multicast addresses

broadcast address (255.255.255.255)

localhost addresses (192.168.254.0 - 192.168.255.255)

addresses from BTS private subnets

transport Interface IP addresses of the network element


The following limitations also exist:


No duplicate addresses can be configured.

Configured addresses can be from the BTS subnet or from any subnet that can be routed through the BTS subnet interface.

Configured addresses cannot belong to the transport network (plain or VLAN).


The RAN2083: ProxyARP in BTS feature is enabled as soon as the first IP address is entered in the ARP table.


https://online.portal.nokiasiemensnetworks.com/pic/nedproxy/NED?action=retrieve&source=xdoc&library=a25003a0000b5241476p1&item=images/note.png

If the BTS OAM subnet is changed, the new address should be added to the ProxyARP list beforehand. Once the subnet is changed, the old address can be removed from the list



















BR