1SNMP::Info::CDP(3) User Contributed Perl Documentation SNMP::Info::CDP(3)
2
6 SNMP::Info::CDP - SNMP Interface to Cisco Discovery Protocol (CDP)
7 using SNMP
8
10 Max Baker
11
13 my $cdp = new SNMP::Info (
14 AutoSpecify => 1,
15 Debug => 1,
16 DestHost => 'router',
17 Community => 'public',
18 Version => 2
19 );
20 my $class = $cdp->class();
22 print " Using device sub class : $class\n";
23 $hascdp = $cdp->hasCDP() ? 'yes' : 'no';
25 # Print out a map of device ports with CDP neighbors:
27 my $interfaces = $cdp->interfaces();
28 my $cdp_if = $cdp->cdp_if();
29 my $cdp_ip = $cdp->cdp_ip();
30 my $cdp_port = $cdp->cdp_port();
31 foreach my $cdp_key (keys %$cdp_ip){
33 my $iid = $cdp_if->{$cdp_key};
34 my $port = $interfaces->{$iid};
35 my $neighbor = $cdp_ip->{$cdp_key};
36 my $neighbor_port = $cdp_port->{$cdp_key};
37 print "Port : $port connected to $neighbor / $neighbor_port\n";
38 }
39
41 SNMP::Info::CDP is a subclass of SNMP::Info that provides an object
42 oriented interface to CDP information through SNMP.
43 CDP is a Layer 2 protocol that supplies topology information of devices
45 that also speak CDP, mostly switches and routers. CDP is implemented
46 by Cisco and several other vendors.
47 Create or use a device subclass that inherits this class. Do not use
49 directly.
50 Each device implements a subset of the global and cache entries. Check
52 the return value to see if that data is held by the device.
53 Inherited Classes
55 None.
56 Required MIBs
58 CISCO-CDP-MIB
59
61 These are methods that return scalar values from SNMP
62 $cdp->hasCDP()
64 Is CDP is active in this device?
65 Accounts for SNMP version 1 devices which may have CDP but not
67 cdp_run()
68 $cdp->cdp_run()
70 Is CDP enabled on this device? Note that a lot of Cisco devices
71 that implement CDP don't implement this value. @#%$!
72 ("cdpGlobalRun")
74 $cdp->cdp_interval()
76 Interval in seconds at which CDP messages are generated.
77 ("cdpGlobalMessageInterval")
79 $cdp->cdp_holdtime()
81 Time in seconds that CDP messages are kept.
82 ("cdpGlobalHoldTime")
84 $cdp->cdp_gid()
86 Returns CDP device ID.
87 This is the device id broadcast via CDP to other devices, and is
89 what is retrieved from remote devices with $cdp->id().
90 ("cdpGlobalDeviceId")
92
94 These are methods that return tables of information in the form of a
95 reference to a hash.
96 CDP CACHE ENTRIES
98 $cdp->cdp_capabilities()
99 Returns Device Functional Capabilities. Results are munged into an
100 ascii binary string, MSB. Each digit represents a bit from the
101 table below from the CDP Capabilities Mapping to Smartport Type
102 table within the Cisco Small Business 200 Series Smart Switch
103 Administration Guide,
104 <http://www.cisco.com/c/en/us/support/switches/small-business-200-series-smart-switches/products-maintenance-guides-list.html>:
105 (Bit) - Description
107 (0x400) - Two-Port MAC Relay.
109 (0x200) - CAST Phone Port / CVTA / Supports-STP-Dispute depending
110 upon platform.
111 (0x100) - Remotely-Managed Device.
112 (0x80) - VoIP Phone.
113 (0x40) - Provides level 1 functionality.
114 (0x20) - The bridge or switch does not forward IGMP Report packets
115 on non router ports.
116 (0x10) - Sends and receives packets for at least one network layer
117 protocol. If the device is routing the protocol, this bit should
118 not be set.
119 (0x08) - Performs level 2 switching. The difference between this
120 bit and bit 0x02 is that a switch does not run the Spanning-Tree
121 Protocol. This device is assumed to be deployed in a physical loop-
122 free topology.
123 (0x04) - Performs level 2 source-route bridging. A source-route
124 bridge would set both this bit and bit 0x02.
125 (0x02) - Performs level 2 transparent bridging.
126 (0x01) - Performs level 3 routing for at least one network layer
127 protocol.
128 Thanks to Martin Lorensen for a pointer to the original information
130 and CPAN user Alex for updates.
131 ("cdpCacheCapabilities")
133 $cdp->cdp_domain()
135 Returns remote VTP Management Domain as defined in
136 "CISCO-VTP-MIB::managementDomainName"
137 ("cdpCacheVTPMgmtDomain")
139 $cdp->cdp_duplex()
141 Returns the port duplex status from remote devices.
142 ("cdpCacheDuplex")
144 $cdp->cdp_id()
146 Returns remote device id string
147 ("cdpCacheDeviceId")
149 $cdp->cdp_if()
151 Returns the mapping to the SNMP Interface Table.
152 Note that a lot devices don't implement $cdp->cdp_index(), So if
154 it isn't around, we fake it.
155 In order to map the cdp table entry back to the interfaces() entry,
157 we truncate the last number off of it :
158 # it exists, yay.
160 my $cdp_index = $device->cdp_index();
161 return $cdp_index if defined $cdp_index;
162 # if not, let's fake it
164 my $cdp_ip = $device->cdp_ip();
165 my %cdp_if
167 foreach my $key (keys %$cdp_ip){
168 $iid = $key;
169 ## Truncate off .1 from cdp response
170 $iid =~ s/\.\d+$//;
171 $cdp_if{$key} = $iid;
172 }
173 return \%cdp_if;
175 $cdp->cdp_index()
177 Returns the mapping to the SNMP2 Interface table for CDP Cache
178 Entries.
179 Most devices don't implement this, so you probably want to use
181 $cdp->cdp_if() instead.
182 See cdp_if() entry.
184 ("cdpCacheIfIndex")
186 $cdp->cdp_ip()
188 If $cdp->cdp_proto() is supported, returns remote IPV4 address
189 only. Otherwise it will return all addresses.
190 ("cdpCacheAddress")
192 $cdp->cdp_addr()
194 Returns remote address
195 ("cdpCacheAddress")
197 $cdp->cdp_platform()
199 Returns remote platform id
200 ("cdpCachePlatform")
202 $cdp->cdp_port()
204 Returns remote Port-ID. Most of the time this is a string with the
205 port name, but this is not guaranteed to be so.
206 ("cdpCacheDevicePort")
208 $cdp->cdp_proto()
210 Returns remote address type received. Usually IP.
211 ("cdpCacheAddressType")
213 $cdp->cdp_ver()
215 Returns remote hardware version
216 ("cdpCacheVersion")
218 $cdp->cdp_vlan()
220 Returns the remote interface native VLAN.
221 ("cdpCacheNativeVLAN")
223 $cdp->cdp_power()
225 Returns the amount of power consumed by remote device in milliwatts
226 munged for decimal placement.
227 ("cdpCachePowerConsumption")
229 $cdp->cdp_cap()
231 Returns hash of arrays with each array containing the system
232 capabilities supported by the remote system. Possible elements in
233 the array are "Router", "Trans-Bridge", "Source-Route-Bridge",
234 "Switch", "Host", "IGMP", "Repeater", "VoIP-Phone",
235 "Remotely-Managed-Device", "Supports-STP-Dispute", and "Two-port
236 Mac Relay".
237
239 $cdp->munge_power()
240 Inserts a decimal at the proper location.
241perl v5.34.0 2021-09-13 SNMP::Info::CDP(3)