Michael McNamara

technology, networking, virtualization and IP telephony

Multicast Routing Protocol (Part 2)

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In part 1 of this post I looked at how to configure DVMRP to facilitate inter-VLAN Multicast commuications on a single switch. In this post I’ll look at how to configure PIM to facilitate inter-VLAN Multicast communications across multiple switches and routers (Layer 3 switches).

I took a few minutes and threw together a quick diagram to help layout the topology (a picture is truly worth a thousand words). There are two core ERS 8600 switches (a switch cluster as Nortel likes to call it these days). There are three VLANs bridged across all four switches in the diagram, VLAN 55, 56 and 200. There is a fourth VLAN, 57, that is routed from ERS 8600 C. The ERS 5520 in the diagram will only be used as a Layer 2 even though it could potentially be used as a Layer 3 device (router).


I’m going to review two possible configurations. The first scenario will be for a client device (VLC Client A) in a VLAN routed by the core ERS 8600s. The second scenario will be for a client device (VLC Client B) in a VLAN routed by a closet ERS 8600.

Lets get on with configuring some ERS 8600 switches. First lets enable PIM globally;

ERS8600-A# config ip pim enable
ERS8600-A# config ip pim fast-joinprune enable

Then we’ll enable PIM on the specific VLANs;

ERS8600-A# config vlan 55 ip pim enable
ERS8600-A# config vlan 56 ip pim enable
ERS8600-A# config vlan 200 ip pim enable

We need to create a CLIP interface to use for PIM routing, we don’t want to tie the PIM routing to a physical interface in case that interface goes down for whatever reason. We’re already using CLIP 1 for our OSPF router ID of 10.1.0.5/32.

ERS8600-A# config ip circuitless-ip-int 2 create 10.1.0.15/255.255.255.255
ERS8600-A# config ip circuitless-ip-int 2 ospf enable
ERS8600-A# config ip circuitless-ip-int 2 pim enable

We need to add a candidate Rendezvous Point Router (RP) pointing it to our CLIP address.

ERS8600-A# ip pim candrp add grp 239.255.1.1 mask 255.255.255.255 rp 10.1.0.15

We need to set the priority of the Bootstrap Router (BSR) for dynamic PIM routing.

ERS8600-A# ip pim interface 10.1.0.15 cbsrpreference 100

Then on the second core ERS 8600 switch;

ERS8600-B# config ip pim enable
ERS8600-B# config ip pim fast-joinprune enable
ERS8600-B# config vlan 55 ip pim enable
ERS8600-B# config vlan 56 ip pim enable
ERS8600-B# config vlan 200 ip pim enable
ERS8600-B# config ip circuitless-ip-int 2 create 10.1.0.16/255.255.255.255
ERS8600-B# config ip circuitless-ip-int 2 ospf enable
ERS8600-B# config ip circuitless-ip-int 2 pim enable
ERS8600-B# config ip pim candrp add grp 239.255.1.1 mask 255.255.255.255 rp 10.1.0.16
ERS8600-B# config ip pim interface 10.1.0.16 cbsrpreference 50

That’s really all there is to configure with the two core ERS 8600 switches.

ERS5520 Switch (Edge)
In the case of the ERS 5520 switch there really isn’t anything you need to configure per say. You could enable IGMP (generally disabled by default) to filter the multicast traffic from ports that are not subscribing to any multicast groups. Since the ERS8600s are performing the routing the ERS5520 acts just like a Layer 2 switch.

VLC Client A (10.1.56.50) should now be able to connect to the multicast group 239.255.1.1 from the ERS 5520 which will be sourced from the VLC Server (10.1.55.50).

ERS8600 C Switch (Edge)
In the case of the ERS 8600 switch (edge) you need to configure and enable PIM. We’ll using VLAN 200 to interface with the upstream ERS8600 switches

ERS8600-C:5# config ip pim enable
ERS8600-C:5# config vlan 57 ip pim enable
ERS8600-C:5# config vlan 57 ip pim interface-type passive
ERS8600-C:5# config vlan 200 ip pim enable

Since there won’t be any other Layer 3 PIM switches on VLAN 57 we set the PIM interface to passive (much like the OSPF equivalent of passive).

VLC Client B (10.1.57.50) should now be able to connect to the multicast group 239.255.1.1 from the ERS 8600 C which will be sourced from the VLC Server (10.1.55.50).

We can dump the multicast (PIM) routing table with the following command from the edge ERS8600 switch;

ERS8600-C:5# show ip pim mroute

================================================================================
Pim Multicast Route
================================================================================
Src: 0.0.0.0 Grp: 230.0.0.2 RP: 10.1.0.5 Upstream: 10.1.200.5
Flags: WC RP CACHE
Incoming Port: Vlan200-1/1,
Outgoing Ports: Vlan127-2/42,
Joined Ports:
Pruned Ports:
Leaf Ports: Vlan127-2/42,
Asserted Ports:
Prune Pending Ports:
Assert Winner Ifs:
Assert Loser Ifs:
TIMERS:
Entry JP RS Assert
151 1 0 0
VLAN-Id: 200
Join-P: 0
Assert: 0
——————————————————————————–
Src: 10.1.233.30 Grp: 230.0.0.2 RP: 10.1.0.5 Upstream: 10.1.200.5
Flags:
SPT CACHE SG
Incoming Port: Vlan200-1/1,
Outgoing Ports: Vlan127-2/42,
Joined Ports:
Pruned Ports:
Leaf Ports: Vlan127-2/42,
Asserted Ports:
Prune Pending Ports:
Assert Winner Ifs:
Assert Loser Ifs:
TIMERS:
Entry JP RS Assert
64 4 0 0
VLAN-Id: 200
Join-P: 0
Assert: 0
——————————————————————————–

Total Num of Entries Displayed 2
Flags Legend:
SPT = Shortest path tree, WC=(*,Grp) entry, RP=Rendezvous Point tree, CACHE=Kernel Cache, ASSERTED=Asserted, SG=(Src,Grp) entry, PMBR=(*,*,RP) entry, FWD_TO_RP=Forwarding to RP, FWD_TO_DR=Forwarding to DR, SG_NODATA=SG Due to Join, CP_TO_CPU=Copy to CPU, STATIC_MROUTE=Static Mroute, MRTF_SMLT_PEER_SG=Peer SG On Non-DR For SMLT
——————————————————————————–

Troubleshooting

Here are some basic commands that should help you troubleshoot any PIM issues;

ERS8600-A:5# show ip pim neighbor

================================================================================
Pim Neighbor
================================================================================
INTERFACE ADDRESS UPTIME EXPIRE
——————————————————————————–
Vlan55 10.1.55.6 31 day(s), 00:09:53 0 day(s), 00:01:40
Vlan56 10.1.56.6 31 day(s), 00:09:53 0 day(s), 00:01:40
Vlan200 10.1.200.6 31 day(s), 00:09:53 0 day(s), 00:01:34

Total PIM Neighbors = 3

We can see that all three VLAN interfaces have PIM neighbors with the ERS 8600 B switch. Lets just check the RPs and make sure we have the correct multicast groups (addresses).

ERS8600-A:5# show ip pim rp-set

================================================================================
Pim RPSet
================================================================================
GRPADDRESS GRPMASK ADDRESS HOLDTIME EXPTIME
——————————————————————————–
230.0.0.1 255.255.255.255 10.1.0.15 150 137
230.0.0.2 255.255.255.255 10.1.0.15 150 137
239.255.1.1 255.255.255.255 10.1.0.15 150 137

The multicast addresses of 230.0.0.1 and 230.0.0.2 listed above are used for Nortel’s Contact Center (formerly Symposium Call Center software). Here’s how we can list the candidate RPs;

ERS8600-A:5# show ip pim candidate-rp

================================================================================
Pim Candidate RP Table
================================================================================
GRPADDR GRPMASK RPADDR
——————————————————————————–
230.0.0.1 255.255.255.255 10.1.0.15
230.0.0.2 255.255.255.255 10.1.0.15
239.255.1.1 255.255.255.255 10.1.0.15

If we’re dynamically choosing a RP we need to make sure that there is a BSR active;

ERS8600-A:5# show ip pim bsr

================================================================================
Current BootStrap Router Info
================================================================================

Current BSR address: 10.1.0.15
Current BSR priority: 100
Current BSR HashMask: 255.255.255.252
Current BSR Fragment Tag: 44590
Pim Bootstrap Timer : 31

I may need to update this article to make it cleaner and clearer.

Cheers!

Multicast Routing Protocol (Part 1)

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I was originally just going to write about DVMRP, but I’ve also decided to post some basic examples for setting up PIM-SM. I’ll break this post into two parts; first part will look at utilizing DVMRP to setup a simple Multicast domain on a single switch while the second part will look at utilizing PIM-SM across multiple switches.

We have a few Nortel Contact Center (formerly Symposium) installations deployed throughout the organization. The Nortel Agent Desktop Display (ADD) utilizes multicast to distribute the information between the server and the individual clients. Unless the clients are in the same VLAN as the server (Application/Web server and Database server) you’re going to need a Multicast Routing Protocol to facilitate the multicast communications between VLANs. I should point out that at this point I’m only talking about making multicast traffic available between VLANs on a single Nortel Ethernet Routing Switch 8600.

Note: Nortel Contact Center 6.0 appears to use the following two Multicast addresses by default; 230.0.0.1, 230.0.0.2

Unfortunately I didn’t have a spare Contact Center server to test with so I needed to figure out how I could test multicast traffic ahead of time and then just schedule any changes that needed to be made to facilitate inter-VLAN multicast communications. I recalled that VideoLAN – VLC media player could stream audio/video via multicast.

In order to test I setup two laptops running Windows XP Service Pack 2, laptop A (10.1.55.50/24) on VLAN 55 (10.1.55.0/24) and laptop B (10.1.56.50/24) on VLAN 56 (10.1.56.0/24).

Laptop A will be the broadcast server and stream the video while laptop B will be the client.

Let’s setup the ERS 8600 switch;

ERS-8610:6# config vlan 55 create byport 1
ERS-8610:6# config vlan 55 ip address 10.1.55.5/24
ERS-8610:6# config vlan 55 ip ospf enable
ERS-8610:6# config vlan 55 ip vrrp 1 10.1.55.1
ERS-8610:6# config vlan 55 ip dvmrp enable
ERS-8610:6# config vlan 56 create byport 1
ERS-8610:6# config vlan 56 ip address 10.1.56.5/24
ERS-8610:6# config vlan 56 ip ospf enable
ERS-8610:6# config vlan 56 ip vrrp 1 10.1.56.1
ERS-8610:6# config vlan 56 ip dvmrp enable

And then some global settings;

ERS-8610:6# config ip dvmrp enable
ERS-8610:6# config ip ospf enable

Now we need to look at how to make VLC do what we need;

Once you install VLC and start the program you will be greeted by this lightweight frontend.

Click File -> Open File to bring up the Open dialog box.

Click on the Browse button to bring up a standard Windows file selection box. Select the file you want to play. Then click Open.

Your selection should appear in the text box next to the Browse button. Click the check box for Stream Output and then click the button Settings.

If you wish to view the video on the source laptop then check the box next to Play Locally under Output Methods. When streaming to another system you don’t have to play the file on the server, but you can use this option to visually confirm that our video is playing properly before trying to access the stream from another computer.

Check the box marked UDP and type in the Muticast address you want to stream the file to. You should use a local-scope multicast address between 239.0.0.0 – 239.255.255.255. You should also make sure that the Time-To-Live (TTL) is set to 2. Then click OK. The file is ready to play so click OK in the Open dialog box too.

The video or audio file should begin playing on the computer. The last thing to do before switching to the second laptop is to turn on VLC’s web interface by clicking Settings -> Add Interface -> Web Interface. This will help provide remote control over VLC if we should need it from the second laptop.

Open VLC on the second laptop.

Click on File -> Open Network Stream. Select UDP/RTP Multicast and use the same Multicast address you use on the server. Click the OK button and VLC will start playing your stream.

Now that the stream is successfully playing on your computer you can open up a web browser to control VLC remotely. Type http://10.1.55.10:8080/ into the address bar. The web browser will present you with all of the controls you need to manage playlists and playback remotely.

If you’ve setup the ERS8600 properly your video should start playing on the client laptop.

If you want to make sure that VLC is configured and working properly move both laptops to the same VLAN. If the video stream works then you know that VLC is working properly and you need to focus the network configuration.

Note: Windows XP defaults to IGMP v3 which is fine for this test.

You can use the following commands to troubleshoot the network pieces. In the examples below I had the laptops connected to an ERS 5520 switch which was uplink on port 1/1. That is why the port is reported as 1/1 throughout the different commands.

DVMRP

ERS-8610:6# show ip dvmrp info
==================================================================                        Dvmrp General Group
==================================================================

AdminStat               : enabled
Genid                   : 0x47c42ef1
Version                 : 3
NumRoutes               : 2
NumReachableRoutes      : 2

UpdateInterval          : 60
TriggeredUpdateInterval : 5
LeafTimeOut             : 125
NbrTimeOut              : 35
NbrProbeInterval        : 10
FwdCacheTimeout         : 300
RouteExpireTimeout      : 140
RouteDiscardTimeout     : 260
RouteSwitchTimeout      : 140
ShowNextHopTable        : disable
generate-trap            : disable
generate-log             : disable
PruneResend             : disable

ERS-8610:6# show ip dvmrp interface

================================================================================                        Dvmrp Interface
================================================================================                                         DEFAULT DEFAULT DEFAULT ADVERTISEIF        ADDR            METRIC OPERSTAT LISTEN  SUPPLY  METRIC  SELF
-------------------------------------------------------------------------------
Vlan55    10.1.55.1       1      up       enable  disable 1       enable
Vlan56    10.1.56.1       1      up       enable  disable 1       enable

2 out of 2 entries displayed

--------------------------------------------------------------------------------
IF        ADDR            IN-POLICY       OUT-POLICY      INTF TYPE
--------------------------------------------------------------------------------
Vlan55    10.1.55.1                                      ActiveVlan56    10.1.56.1                                      Active

2 out of 2 entries displayed

ERS-8610:6# show ip dvmrp route

================================================================================
                       Dvmrp Route
================================================================================
SOURCE          MASK            UPSTREAM_NBR    INTERFACE  METRIC EXPIRE
--------------------------------------------------------------------------------
10.107.55.0     255.255.255.0   0.0.0.0         Vlan55     1      155
10.107.56.0     255.255.255.0   0.0.0.0         Vlan56     1      155

2 out of 2 entries displayed

IGMP 

ERS-8610:6# show ip igmp cache
================================================================================
                        Igmp Cache
================================================================================
GRPADDR         INTERFACE  LASTREPORTER    EXPIRATION V1HOSTTIMER  TYPE       STATICPORTS
--------------------------------------------------------------------------------
239.255.1.1     Vlan56     10.1.56.50    213        0            DYNAMIC NULL
239.255.255.250 Vlan55     10.1.55.50    214        0            DYNAMIC NULL
239.255.255.250 Vlan56     10.1.56.50    219        0            DYNAMIC NULL

3 out of 3 entries displayed

ERS-8610:6# show ip igmp group

================================================================================
                        Igmp Group
================================================================================
GRPADDR         INPORT          MEMBER          EXPIRATION TYPE
-------------------------------------------------------------------------------
239.255.1.1     V56-1/1         10.1.56.50      209        Dynamic
239.255.255.250 V55-1/1         10.1.55.50      210        Dynamic
239.255.255.250 V56-1/1         10.1.56.50      215        Dynamic

Total number of groups 3Total number of unique groups 2

ERS-8610:6# show ip igmp sender

================================================================================
                        Igmp Sender
===============================================================================
GRPADDR         IFINDEX    MEMBER          PORT       STATE
--------------------------------------------------------------------------------
239.255.1.1     Vlan 55    10.1.55.50      1/1        NOTFILTERED

1 out of 1 entries displayed

Hopefully I haven’t gone over the top on this one.

Please post any comments, corrections or suggestions.

Cheers!

How to set passwords from the CLI?

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There have been quite a few comments posted to the Factory Reset Nortel Ethernet Switch article. One of those comments requested some help in how to set the passwords from the CLI (command line interface). You’ll obviously need the read-write password in order to login to the switch and reset the passwords. Without the read-write password you’ll need to factory reset the switch.

Note: I’m still trying to figure out the best way to display the CLI stuff… if I use the PRE HTML tag the font is really too small, if I don’t use the PRE HTML tag the formatting (spacing) gets lost making it difficult to compare the post with the real world output from a CLI interface.

Nortel Ethernet Routing Switch 5500 Series (v5.1)

Here’s how to set the passwords on the Nortel Ethernet Routing Switch 5500 Series (v5.1 software).

5520-48T-PWR>enable
5520-48T-PWR#config term
Enter configuration commands, one per line.  End with CNTL/Z.

What’s the syntax to set the read-only and read-write passwords?

5520-48T-PWR(config)#cli password ?
read-only   Modify read-only password
read-write  Modify read-write password
serial      Enable/disable serial port password.
telnet      Enable/disable telnet and web password.

We’ll use the commands below to set the read-only (RO) password to “readonlypassword” and the ready-write (RW) passwords to “readwritepassword”;

5520-48T-PWR(config)#cli password read-only readonlypassword
5520-48T-PWR(config)#cli password read-write readwritepassword

What is the syntax to enable the passwords on the serial and telnet interfaces?

5520-48T-PWR(config)#cli password serial ?
local   Use local password.
none    Disable password.
radius  Use RADIUS password authentication.
tacacs  Use TACACS+ AAA services

5520-48T-PWR(config)#cli password telnet ?
local   Use local password.
none    Disable password.
radius  Use RADIUS password authentication.
tacacs  Use TACACS+ AAA services

We’ll use the commands below to set the serial and telnet interface to use the local passwords we’ve just configured above. You could also use RADIUS and TACACS authentication if you set it up.

5520-48T-PWR(config)#cli password serial local
5520-48T-PWR(config)#cli password telnet local

And let’s not forget to save the configuration file (even though the switch should auto-save it).

5520-48T-PWR(config)#copy config nvram
5520-48T-PWR(config)#exit
5520-48T-PWR#disable
5520-48T-PWR>

Nortel Ethernet Routing Switch 4500 Series (v5.0)

The Nortel Ethernet Routing Switch 4500 Series (v5.0 software) is piratically identical to the 5500 series except that it does not yet support TACACS authentication.

4548GT-PWR(config)#cli password ?
read-only   Modify read-only password
read-write  Modify read-write password
serial      Enable/disable serial port password.
telnet      Enable/disable telnet and web password.

4548GT-PWR(config)#cli password serial ?
local   Use local password.
none    Disable password.
radius  Use RADIUS password authentication.

4548GT-PWR(config)#cli password telnet ?
local   Use local password.
none    Disable password.
radius  Use RADIUS password authentication.

Nortel Ethernet Switch 460/470 (v3.7.2)

The Nortel Ethernet Switch 460/470 (v3.7.2 software) is identical to the ERS 4500 series.

470-48T>enable
470-48T#config term
Enter configuration commands, one per line.  End with CNTL/Z.

470-48T(config)#cli password ?
read-only   Modify read-only password
read-write  Modify read-write password
serial      Enable/disable serial port password.
telnet      Enable/disable telnet and web password.

470-48T(config)#cli password serial ?
local   Use local password.
none    Disable password.
radius  Use RADIUS password authentication.

470-48T(config)#cli password telnet ?
local   Use local password.
none    Disable password.
radius  Use RADIUS password authentication.

Hopefully this should help a few folks out.

Cheers!

Ethernet Frames Maligned

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I thought I would share this story with everyone. We had discovered an issue with Ethernet frames being maligned/corrupted between the Motorola Access Port 300 (AP300) and the Motorola Wireless (WS5100) LAN Switch.

We had a ticket open with Motorola trying to understand why a significant number of our AP300s were rebooting themselves at odd hours during the early morning. Motorola had requested that we provide network traces at the Access Point and Wireless Switch. Surprisingly Motorola came back and pointed out that the payload in some of the Ethernet frames was getting modified between the Wireless Switch and the Access Port.

The fundamental equipment involved in this problem were as follows; Nortel Ethernet Switch 460 (ES 460), Ethernet Switch 470 (ES 470), Ethernet Routing Switch 5520 (ERS 5520), Ethernet Routing Switch 8600 (ERS8600); Motorola Wireless LAN Switch 5100 (WS5100) and Access Ports 300(AP300).

The Motorola WS5100s and AP300s are physically connected over the same Layer 2 Ethernet network. The “Ethernet 1” port on the WS5100 is connected to a Virtual Local Area Network (VLAN) which provides a single broadcast domain for all AP 300s to connect to the WS5100. The “Ethernet 2” port on the WS5100 is used as a trunk interface to bridge between the WLANs (wireless) and VLANs (wired) segments. We essentially have core switches and edge switches (distribution is collapsed down into the core). The core switch can be a single ERS8600 or a pair of ERS8600s (Layer 3) connected via an IST (Inter-Switch Trunk). At the edge we generally deploy ES470(Layer 2) or ERS5520(Layer 2). We have deployed ES460s (PoE) into closets where ES470s are already present to specifically support PoE and the wireless network.

Here is a quick topology of the network with respect to the WS5100s and AP300s.
We recently started deploying the ERS5520s (in place of the ES470s) which directly support PoE allowing us to deploy one less piece of equipment at the edge and also provides one less bridge (hop) to switch through.We have been plagued by a problem that is affecting the Motorola AP300s causing them to randomly reset and re-adopt at different times of the day without warning or cause. In searching for the cause of this problem we’ve documented numerous Ethernet frames being maligned as they travel from the AP300 to the WS5100.

With respect to the examples I’m going to draw the following topology applies;

It should be noted that we do use the ES460s and ERS5520s to remark the 802.1p bits in the Ethernet frame so we can provide some measure of QoS with respect to the Nortel (Spectralink) Wireless LAN phones that we currently have deployed. In essence we mark all Ethernet packets on the “APVLAN” with a QoS level of 4 (“Gold”, BoSS-65530).

Network Trace Analysis

I will refer to the following two trace files;

“ers460side1.pcap” closet ES460 trace
“ers8600side1.pcap” core ERS8600 trace

I tried to merge up the two traces so each trace is synchronous with the other. We’ll focus on packet 3, you can see in the closet ES460 trace that bytes 15 and 16 are 0x20 and 0x12 respectively.

Looking at the other trace you can see that bytes 15 and 16 are different than in the first trace. You can see that the bits in 16 have been shifted to bytes 26.

You can again see the same problem in packet 4;


You can see it again in packets 6, 7, 10, 39, 43, 45, etc.

In the end the problem turned out to be a software/hardware issue with the Nortel Ethernet Routing Switch 8600. If DiffServ was enabled on the Ethernet port that was being mirrored, the mirrored data was somehow getting corrupted in the process of copying the packets. Once we disabled DiffServ on the Ethernet port the problem disappeared. We opened a case with Nortel but were told that it would be handled as an enhancement request, not a correction request (go figure!).

I personally no longer trust either the port mirror or packet capture facilities of the Nortel ERS 8600 and rely on physical taps so there can be no doubt or questions about the validity of the capture data.

We still have issues with our Motorola AP300s rebooting from time to time but they have been much better since Motorola released v2.1.3 software for the WS5000/WS5100s. We are currently working with Motorola to resolve issues in their v3.x software line that is causing our Nortel 2211 (Spectralink) wireless phones to occasionally reboot while idle and roaming.

Cheers!

ERS 5500 Advanced Routing License

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The Nortel ERS 5500 Series switches support Layer 3 switching (routing) but only with static routes. The Advanced Routing License is required to provide the following features;

  • OSPF (Open Shortest Path First) Routing
  • VRRP (Virtual Routing Redundancy Protocol)
  • ECMP (Equal Cost Multi-Path)
  • SMLT (Split Multilink Trunking)
  • IPFIX (IP Flow Information Export)

The license is based on a switch or stack – a single license will be required for a standalone switch or for a stack of up to eight units. A single license will enable all of the features described above.

I believe Nortel is selling the licenses in counts of 1, 10, 50 or 100. The licenses will be tied to the MAC address of the switch with some amount of flexibility should a switch fail or need to be replaced.

Did you know that there is a 30 day demo license available?

As of software release v5.1 there is a 30 day demo license available which you can load on the switch to evaluate the different features. I’m currently running two ERS 5500 series switches with the 30 day demo license testing the OSPF functionality.

The 30 day demo license can be found on Nortel website just below the v5.1 software release. Once you’ve retrieved the demo license (filename: 30daydemo.lic) you’ll need to place it on a TFTP server (or you could try a USB flash drive if your working with an ERS 5530 switch).

ERS5530>enable
ERS5530#copy tftp license 192.168.1.20 30daydemo.lic

Later versions of software have a slightly different syntax;

ERS5530>enable
ERS5530#copy tftp license address 192.168.1.20 filename bld_6_2_demo.lic

You would of course need to substitute your TFTP server IP address with 192.168.1.20 above. Once you’ve downloaded the license you’ll need to restart the switch to activate the license. After the switch has restarted you can use the following command to check the license;

ERS5530# show license all
Number of licenses:  1
---------------------------------------------------------
License 1
---------------------------------------------------------
version:         0
md5_key:         9f8d802b 1459576e 7d0b8951 af8e1751
md5_file:        8375fe89 ea7eb5e2 fa155e7a 181410c8
time_base:       2007/06/22 08:19:01
time_modify:     2007/06/22 08:19:01
time_expiration: 28 days, 05:05:00
num_unique_ids:  1
flags:           0x0000000d SINGLE EXPIRE EMERGENCY
memo:

*** This is a temporary  license valid for 30 days.  A valid license is ***
*** required  for uninterrupted operation  of the switch.  There may be ***
*** service impact if this temporary license is not removed in 30 days. ***

You can also delete the existing software licenses with the following command;

ERS5530# clear license all

Cheers!

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