MALLOC-MIB

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Organization: IETF MALLOC Working Group

Last Updated: 2003-06-09

Category: Routing Protocols

Description: Defines managed objects for management and monitoring of Multicast Address Allocation (MALLOC) servers.

IPNetwork Monitor uses several OIDs from this MIB in network discovery and polling the applicable devices. Start monitoring MALLOC-MIB with a free 30-day trial of IPNetwork Monitor.

What Is MALLOC-MIB?

MALLOC-MIB is an IETF standards-track MIB (RFC 3559) for managing Multicast Address Allocation (MALLOC) servers, which implement the MADCAP protocol for dynamically allocating multicast group addresses within administrative scopes. It exposes a scope table describing configured multicast address scopes (address ranges, hop limits, source and server addresses) along with server capability information. This is primarily a configuration/service-status MIB: it lets an operator verify that multicast address scopes are correctly defined and that the allocation server is reachable and serving the expected address ranges, which is important for diagnosing multicast address allocation failures in MADCAP-enabled networks. It is explicitly built on and references the MADCAP protocol standard and general SNMP SMIv2 conventions as its dependency. It is deployed on multicast address allocation servers within enterprise or research networks running dynamic multicast applications. Engineers implementing or auditing this functionality typically reference the MALLOC-MIB RFC/standard documentation for the authoritative specification.

IPNetwork Monitor allows you to monitor SNMP objects defined in MALLOC-MIB. Use the built-in SNMP Monitoring Browser to explore available variables, view their current values and descriptions, and select the objects you want to monitor. You can then create SNMP monitors, configure thresholds, and receive alerts when monitored values change.

Supported Devices

vendor-neutral, standards-based MIB, not tied to a specific manufacturer
multicast address allocation (MADCAP) server

Monitoring Examples

An admin would poll mallocScopeTable/mallocScopeEntry to inspect mallocScopeFirstAddress, mallocScopeLastAddress, and mallocScopeHopLimit for a given scope, confirming the address range and TTL scoping match network policy. If mallocScopeStatus shows a scope as not active despite being expected, or mallocScopeServerAddress points to an unreachable server, that would explain client MADCAP allocation failures. mallocCapabilities would be checked to confirm which allocation features (e.g., mallocScopeDivisible) the server supports.

What Can Be Monitored

configured multicast scope address range
scope hop limit
scope operational status
allocation server address
scope divisibility capability

Imported Objects

From IANA-MALLOC-MIB

IANAmallocRangeSource
IANAscopeSource

From INET-ADDRESS-MIB

InetAddress
InetAddressType

From IPMROUTE-STD-MIB

LanguageTag

From SNMP-FRAMEWORK-MIB

SnmpAdminString

From SNMPv2-CONF

MODULE-COMPLIANCE
OBJECT-GROUP

From SNMPv2-SMI

Counter32
Gauge32
MODULE-IDENTITY
OBJECT-IDENTITY
OBJECT-TYPE
Unsigned32
mib-2

From SNMPv2-TC

RowStatus
StorageType
TruthValue

How to Use in IPNetwork Monitor

Example using madcapTotalErrors OID:

Select a device implementing MALLOC-MIB as the target host to create a monitor — the SNMP service should be up and running on it. Click New Monitor, then check SNMP Custom on the Favorites tab, click Next, and confirm the host. On the next page, click Select... to open the built-in SNMP MIB Browser and type madcapTotalErrors into the Find box to locate it in the OID tree, then select it and click OK. The total number of transactions for which the MADCAP server has detected an error of any type, regardless of whether the server ignored the request or generated a NAK. On the monitor's Main parameters page you can set the target's SNMP port (default 161), credentials, polling interval, and other settings — see the SNMP Monitor help for details. On the State conditions and Alerting tabs, configure when the monitor should change state and trigger an alert; since this is a Counter32-type OID, Value bounds is the most useful condition here — trigger an alert if the counter increases between polls, since a rising count of errors, failures, or discards often points to a real underlying problem. Click Finish to create the monitor; you can adjust any parameter later.

OIDs

OID symbolic	OID numeric	Type	Access	Description
madcap	1.3.6.1.2.1.101.1.2
C32 madcapBadLeaseIds	1.3.6.1.2.1.101.1.2.2.5	Counter32	read-only	The number of requests received by the MADCAP server with an unrecognized Lease Identifier, regardless of whether NAKs were sent. This corresponds to the Lease Identifier Not Recognized error code in MADCAP.
madcapClientGroup	1.3.6.1.2.1.101.2.2.5			A collection of objects providing management of MADCAP clients.
madcapConfig	1.3.6.1.2.1.101.1.2.1			Group of objects that count various MADCAP events.
U32 madcapConfigClockSkewAllowance	1.3.6.1.2.1.101.1.2.1.5	Unsigned32	read-write	The clock skew threshold used by the MADCAP server to generate Excessive Clock Skew errors.
U32 madcapConfigExtraAllocationTime	1.3.6.1.2.1.101.1.2.1.1	Unsigned32	read-write	The amount of extra time on either side of a lease which the MADCAP server allocates to allow for clock skew among clients.
U32 madcapConfigNoResponseDelay	1.3.6.1.2.1.101.1.2.1.2	Unsigned32	read-write	The amount of time the MADCAP client allows for receiving a response from a MADCAP server.
U32 madcapConfigOfferHold	1.3.6.1.2.1.101.1.2.1.3	Unsigned32	read-write	The amount of time the MADCAP server will reserve an address for after sending an OFFER message in anticipation of receiving a REQUEST message.
U32 madcapConfigResponseCacheInterval	1.3.6.1.2.1.101.1.2.1.4	Unsigned32	read-write	The amount of time the MADCAP server uses to detect duplicate messages.
madcapCounters	1.3.6.1.2.1.101.1.2.2			A group of objects that count various MADCAP events.
C32 madcapDiscovers	1.3.6.1.2.1.101.1.2.2.6	Counter32	read-only	The number of DISCOVER messages received by the MADCAP server.
C32 madcapExcessiveClockSkews	1.3.6.1.2.1.101.1.2.2.4	Counter32	read-only	The number of requests received by the MADCAP server with an excessive clock skew, regardless of whether NAKs were sent. This corresponds to the Excessive Clock Skew error code in MADCAP.
C32 madcapInforms	1.3.6.1.2.1.101.1.2.2.7	Counter32	read-only	The number of INFORM messages received by the MADCAP server.
C32 madcapInvalidRequests	1.3.6.1.2.1.101.1.2.2.3	Counter32	read-only	The number of invalid requests received by the MADCAP server, regardless of whether NAKs were sent. This corresponds to the Invalid Request error code in MADCAP.
C32 madcapReleases	1.3.6.1.2.1.101.1.2.2.10	Counter32	read-only	The number of RELEASE messages received by the MADCAP server.
C32 madcapRenews	1.3.6.1.2.1.101.1.2.2.9	Counter32	read-only	The number of RENEW messages received by the MADCAP server.
C32 madcapRequests	1.3.6.1.2.1.101.1.2.2.8	Counter32	read-only	The number of REQUEST messages received by the MADCAP server.
C32 madcapRequestsDenied	1.3.6.1.2.1.101.1.2.2.2	Counter32	read-only	The number of valid requests for which the MADCAP server could not complete an allocation, regardless of whether NAKs were sent. This corresponds to the Valid Request Could Not Be Completed error code in MADCAP.
madcapServerGroup	1.3.6.1.2.1.101.2.2.4			A collection of objects providing management of MADCAP servers.
C32 madcapTotalErrorsEx	1.3.6.1.2.1.101.1.2.2.1	Counter32	read-only	The total number of transactions for which the MADCAP server has detected an error of any type, regardless of whether the server ignored the request or generated a NAK.
malloc	1.3.6.1.2.1.101.1.1
IPt mallocAddressAddressType	1.3.6.1.2.1.101.1.1.6.1.1	InetAddressType	not-accessible	The type of the first address in the allocated block. Legal values correspond to the subset of address families for which multicast address allocation is supported.
mallocAddressEntry	1.3.6.1.2.1.101.1.1.6.1		not-accessible	An entry (conceptual row) containing the information on a particular block of allocated addresses. The block of addresses covered by each entry in this table must fall within a range corresponding to an entry in the mallocAllocRangeTable.
IP mallocAddressFirstAddress	1.3.6.1.2.1.101.1.1.6.1.2	InetAddress	not-accessible	The first address in the allocated block. The type of this address is determined by the value of the mallocAddressAddressType object.
U32 mallocAddressNumAddrs	1.3.6.1.2.1.101.1.1.6.1.3	Unsigned32	read-only	The number of addresses in the allocated block.
U32 mallocAddressRequestId	1.3.6.1.2.1.101.1.1.6.1.4	Unsigned32	read-only	The index of the request which caused this block of addresses to be allocated. This value must match the value of mallocRequestId for some entry in the mallocRequestTable.
mallocAddressTable	1.3.6.1.2.1.101.1.1.6		not-accessible	The (conceptual) table containing information on blocks of allocated addresses. This table may be used to map a given multicast group address to the associated request.
T/F mallocAllocRangeAdvertisable	1.3.6.1.2.1.101.1.1.4.1.12	TruthValue	read-create	The value of this object is true if the range is eligible to be advertised to other MAASs. When the row is first created, the default value of this object is true if the scope is divisible, and is false otherwise.
mallocAllocRangeEntry	1.3.6.1.2.1.101.1.1.4.1		not-accessible	An entry (conceptual row) containing the information on a particular allocation range.
IP mallocAllocRangeFirstAddress	1.3.6.1.2.1.101.1.1.4.1.1	InetAddress	not-accessible	The first address in the allocation range. The type of this address is determined by the value of the mallocScopeAddressType object.
IP mallocAllocRangeLastAddress	1.3.6.1.2.1.101.1.1.4.1.2	InetAddress	read-create	The last address in the allocation range. The type of this address is determined by the value of the mallocScopeAddressType object.
U32 mallocAllocRangeLifetime	1.3.6.1.2.1.101.1.1.4.1.5	Unsigned32	read-create	The number of seconds remaining in the lifetime of the (sub)range out of which addresses are being allocated. A value of 0 indicates that the range is not subject to aging.
U32 mallocAllocRangeMaxLeaseAddrs	1.3.6.1.2.1.101.1.1.4.1.6	Unsigned32	read-create	The maximum number of addresses which the server is willing to grant for each future request in this range. A value of 0 means that no specific limit is enforced, as long as the server has valid addresses to allocate.
U32 mallocAllocRangeMaxLeaseTime	1.3.6.1.2.1.101.1.1.4.1.7	Unsigned32	read-create	The maximum lifetime which the server will grant for future requests in this range. A value of 0 means that no additional limit is enforced beyond that of mallocAllocRangeLifetime.
G32 mallocAllocRangeNumAllocatedAddrs	1.3.6.1.2.1.101.1.1.4.1.8	Gauge32	read-only	The number of addresses in the range which have been allocated. This value can be used to determine the current address space utilization within the scoped range. This should match the total number of addresses for this scope covered by entries in the mallocAddressTable.
G32 mallocAllocRangeNumOfferedAddrs	1.3.6.1.2.1.101.1.1.4.1.9	Gauge32	read-only	The number of addresses in the range which have been offered. This number should match the sum of mallocRequestNumAddrs for all entries in the mallocRequestTable in the offered state. Together with mallocAllocRangeNumAllocatedAddrs and mallocAllocRangeNumTryingAddrs, this can be used to determine the address space utilization within the scoped range in the immediate future.
G32 mallocAllocRangeNumTryingAddrs	1.3.6.1.2.1.101.1.1.4.1.11	Gauge32	read-only	The number of addresses in the scope covered by entries in the mallocRequestTable in the trying state.
G32 mallocAllocRangeNumWaitingAddrs	1.3.6.1.2.1.101.1.1.4.1.10	Gauge32	read-only	The number of addresses in the range which have been requested, but whose state is waiting, while the server attempts to acquire more address space.
IAN mallocAllocRangeSource	1.3.6.1.2.1.101.1.1.4.1.4	IANAmallocRangeSource	read-only	The means by which this entry was learned.
ROW mallocAllocRangeStatus	1.3.6.1.2.1.101.1.1.4.1.3	RowStatus	read-create	The status of this row, by which new entries may be created, or old entries deleted from this table. If write access is supported, the other writable objects in this table may be modified even while the status is `active'.
STO mallocAllocRangeStorage	1.3.6.1.2.1.101.1.1.4.1.15	StorageType	read-create	The storage type for this conceptual row. Conceptual rows having the value 'permanent' need not allow write-access to any columnar objects in the row.
mallocAllocRangeTable	1.3.6.1.2.1.101.1.1.4		not-accessible	The (conceptual) table containing information on subranges of addresses from which the device may allocate addresses, if it is a MAAS. If the device is a Prefix Coordinator, any ranges which the device is advertising to MAAS's will be in this table. Note that the device may be both a MAAS and a Prefix Coordinator. Address ranges for different rows must be disjoint, and must be contained with the address range of the corresponding row of the mallocScopeTable. Deleting an allocation range has the side effect of deleting any entries within that range from the mallocAddressTable.
G32 mallocAllocRangeTotalAllocatedAddrs	1.3.6.1.2.1.101.1.1.4.1.13	Gauge32	read-only	The approximate number of addresses in the range which have been allocated by any MAAS, as determined by a Prefix Coordinator. This object need only be present if mallocAllocRangeAdvertisable is true. If the number is unknown, a value of 0 may be reported.
G32 mallocAllocRangeTotalRequestedAddrs	1.3.6.1.2.1.101.1.1.4.1.14	Gauge32	read-only	The approximate number of addresses in the range for which there is potential demand among MAASs, as determined by a Prefix Coordinator. This object need only be present if mallocAllocRangeAdvertisable is true. If the number is unknown, a value of 0 may be reported.
mallocBasicGroup	1.3.6.1.2.1.101.2.2.1			The basic collection of objects providing management of IP multicast address allocation.
BIT mallocCapabilities	1.3.6.1.2.1.101.1.1.1	Bits	read-only	This object describes the capabilities which a client or server supports. The startTime bit indicates that allocations with a future start time are supported. The serverMobility bit indicates that allocations can be renewed or released from a server other than the one granting the original allocation. The retryAfter bit indicates support for a waiting state where the client may check back at a later time to get the status of its request.
mallocClientFullCompliance	1.3.6.1.2.1.101.2.1.5			The compliance statement for hosts implementing the MALLOC MIB with support for read-create. Such clients can then be both monitored and configured with this MIB.
mallocClientGroup	1.3.6.1.2.1.101.2.2.3			A collection of objects providing management of multicast address allocation in clients.
mallocClientReadOnlyCompliance	1.3.6.1.2.1.101.2.1.2			The compliance statement for clients implementing the MALLOC MIB without support for read-create (i.e., in read- only mode). Such clients can then be monitored but can not be configured with this MIB.
mallocClientScopeGroup	1.3.6.1.2.1.101.2.2.6			A collection of objects providing management of multicast scope information in clients.
mallocCompliances	1.3.6.1.2.1.101.2.1
mallocConformance	1.3.6.1.2.1.101.2
mallocGroups	1.3.6.1.2.1.101.2.2
mallocMIB	1.3.6.1.2.1.101			The MIB module for management of multicast address allocation. Copyright (C) The Internet Society (2003). This version of this MIB module is part of RFC 3559; see the RFC itself for full legal notices.
mallocMIBObjects	1.3.6.1.2.1.101.1
mallocPrefixCoordinatorFullCompliance	1.3.6.1.2.1.101.2.1.6			The compliance statement for prefix coordinators implementing the MALLOC MIB with support for read-create. Such devices can then be both monitored and configured with this MIB.
mallocPrefixCoordinatorGroup	1.3.6.1.2.1.101.2.2.7			A collection of objects for managing Prefix Coordinators.
mallocPrefixCoordinatorReadOnlyCompliance	1.3.6.1.2.1.101.2.1.3			The compliance statement for prefix coordinators implementing the MALLOC MIB without support for read-create (i.e., in read-only mode). Such devices can then be monitored but can not be configured with this MIB.
IP mallocRequestClientAddress	1.3.6.1.2.1.101.1.1.5.1.9	InetAddress	read-only	The address of the client that (last) requested this allocation. The type of this address is determined by the value of the mallocRequestClientAddressType object.
IPt mallocRequestClientAddressType	1.3.6.1.2.1.101.1.1.5.1.8	InetAddressType	read-only	The type of the address of the client that (last) requested this allocation.
U32 mallocRequestEndTime	1.3.6.1.2.1.101.1.1.5.1.5	Unsigned32	read-only	The number of seconds remaining before the end time of the request.
mallocRequestEntry	1.3.6.1.2.1.101.1.1.5.1		not-accessible	An entry (conceptual row) containing the information on a particular allocation request.
U32 mallocRequestId	1.3.6.1.2.1.101.1.1.5.1.1	Unsigned32	not-accessible	An arbitrary value identifying this row.
OCT mallocRequestLeaseIdentifier	1.3.6.1.2.1.101.1.1.5.1.12	OCTET STRING	read-only	The Lease Identifier of this request. If the allocation mechanism in use does not use Lease Identifiers, then the value is a 0-length string.
U32 mallocRequestNumAddrs	1.3.6.1.2.1.101.1.1.5.1.6	Unsigned32	read-only	The number of addresses requested. If the addresses have been allocated, this number should match the total number of addresses for this request covered by entries in the mallocAddressTable.
IPt mallocRequestScopeAddressType	1.3.6.1.2.1.101.1.1.5.1.2	InetAddressType	read-only	The type of the first address of the scope to which the request applies. Legal values correspond to the subset of address families for which multicast address allocation is supported.
IP mallocRequestScopeFirstAddress	1.3.6.1.2.1.101.1.1.5.1.3	InetAddress	read-only	The first address of the scope to which the request applies. This must match mallocScopeFirstAddress for some row in the mallocScopeTable. The type of this address is determined by the value of the mallocRequestScopeAddressType object.
IP mallocRequestServerAddress	1.3.6.1.2.1.101.1.1.5.1.11	InetAddress	read-only	The address of the server to which the request was (last) sent. The type of this address is determined by the value of the mallocRequestServerAddressType object.
IPt mallocRequestServerAddressType	1.3.6.1.2.1.101.1.1.5.1.10	InetAddressType	read-only	The type of the address of the server to which the request was (last) sent.
U32 mallocRequestStartTime	1.3.6.1.2.1.101.1.1.5.1.4	Unsigned32	read-only	The number of seconds remaining before the start time of the request. A value of 0 means that the allocation is currently in effect.
INT mallocRequestState	1.3.6.1.2.1.101.1.1.5.1.7	INTEGER	read-only	The state of the request. A value of allocated(1) indicates that one or more entries for this request are present in the mallocAddressTable. A value of offered(2) indicates that addresses have been offered to the client (e.g. via a MADCAP OFFER message), but the allocation has not been committed. A value of waiting(3) indicates that the allocation is blocked while the server attempts to acquire more space from which it can allocate addresses. A value of trying(4) means that no addresses have been offered to the client, but that an attempt to allocate is in progress.
mallocRequestTable	1.3.6.1.2.1.101.1.1.5		not-accessible	The (conceptual) table containing information on allocation requests, whether allocated or in progress. This table may also be used to determine which clients are responsible for high address space utilization within a given scope. Entries in this table reflect requests dynamically received by an address allocation protocol.
IPt mallocScopeAddressType	1.3.6.1.2.1.101.1.1.2.1.1	InetAddressType	not-accessible	The type of the addresses in the multicast scope range. Legal values correspond to the subset of address families for which multicast address allocation is supported.
T/F mallocScopeDivisible	1.3.6.1.2.1.101.1.1.2.1.7	TruthValue	read-create	If false, the server may allocate addresses out of the entire range. If true, the server must not allocate addresses out of the entire range, but may only allocate addresses out of a subrange learned via another method. Creating or deleting a scope which is not divisible has the side effect of creating or deleting the corresponding entry in the mallocAllocRangeTable. Deleting a scope which is divisible has the side effect of deleting any corresponding entries in the mallocAllocRangeTable, and the mallocRequestTable.
mallocScopeEntry	1.3.6.1.2.1.101.1.1.2.1		not-accessible	An entry (conceptual row) containing the information on a particular multicast scope.
IP mallocScopeFirstAddress	1.3.6.1.2.1.101.1.1.2.1.2	InetAddress	not-accessible	The first address in the multicast scope range. The type of this address is determined by the value of the mallocScopeAddressType object.
U32 mallocScopeHopLimit	1.3.6.1.2.1.101.1.1.2.1.4	Unsigned32	read-create	The default IPv4 TTL or IPv6 hop limit which applications should use for groups within the scope.
IP mallocScopeLastAddress	1.3.6.1.2.1.101.1.1.2.1.3	InetAddress	read-create	The last address in the multicast scope range. The type of this address is determined by the value of the mallocScopeAddressType object.
T/F mallocScopeNameDefault	1.3.6.1.2.1.101.1.1.3.1.3	TruthValue	read-create	If true, indicates a preference that the name in the associated language should be used by applications if no name is available in a desired language.
mallocScopeNameEntry	1.3.6.1.2.1.101.1.1.3.1		not-accessible	An entry (conceptual row) containing the information on a particular multicast scope name.
LAN mallocScopeNameLangName	1.3.6.1.2.1.101.1.1.3.1.1	LanguageTag	not-accessible	The RFC 3066 language tag for the language of the scope name.
STR mallocScopeNameScopeName	1.3.6.1.2.1.101.1.1.3.1.2	SnmpAdminString	read-create	The textual name associated with the multicast scope. The value of this object should be suitable for displaying to end-users, such as when allocating a multicast address in this scope. If the scope is an IPv4 scope, and no name is specified, the default value of this object should be the string 239.x.x.x/y with x and y replaced appropriately to describe the address and mask length associated with the scope. If the scope is an IPv6 scope, and no name is specified, the default value of this object should generically describe the scope level (e.g., site).
ROW mallocScopeNameStatus	1.3.6.1.2.1.101.1.1.3.1.4	RowStatus	read-create	The status of this row, by which new entries may be created, or old entries deleted from this table. If write access is supported, the other writable objects in this table may be modified even while the status is `active'.
STO mallocScopeNameStorage	1.3.6.1.2.1.101.1.1.3.1.5	StorageType	read-create	The storage type for this conceptual row. Conceptual rows having the value 'permanent' need not allow write-access to any columnar objects in the row.
mallocScopeNameTable	1.3.6.1.2.1.101.1.1.3		not-accessible	The (conceptual) table containing information on multicast scope names. Entries in this table may be dynamically discovered via some other protocol, such as MZAP, or may be statically configured, such as in an isolated network environment.
IP mallocScopeServerAddress	1.3.6.1.2.1.101.1.1.2.1.9	InetAddress	read-create	The address of a multicast address allocation server to which a request may be sent. The default value is an zero- length address, indicating that no server is known. The type of this address is determined by the value of the mallocScopeServerAddressType object.
IPt mallocScopeServerAddressType	1.3.6.1.2.1.101.1.1.2.1.8	InetAddressType	read-create	The type of the address of a multicast address allocation server to which a request may be sent.
IAN mallocScopeSource	1.3.6.1.2.1.101.1.1.2.1.6	IANAscopeSource	read-only	The method by which this entry was learned.
T/F mallocScopeSSM	1.3.6.1.2.1.101.1.1.2.1.10	TruthValue	read-create	Indicates whether the scope is a Source-Specific Multicast (SSM) range.
ROW mallocScopeStatus	1.3.6.1.2.1.101.1.1.2.1.5	RowStatus	read-create	The status of this row, by which new entries may be created, or old entries deleted from this table. If write access is supported, the other writable objects in this table may be modified even while the status is `active'.
STO mallocScopeStorage	1.3.6.1.2.1.101.1.1.2.1.11	StorageType	read-create	The storage type for this conceptual row. Conceptual rows having the value 'permanent' need not allow write-access to any columnar objects in the row.
mallocScopeTable	1.3.6.1.2.1.101.1.1.2		not-accessible	The (conceptual) table containing information on multicast scopes from which addresses may be allocated. Entries in this table may be dynamically discovered via some other protocol, such as MZAP, or may be statically configured, such as in an isolated network environment. Each scope is associated with a range of multicast addresses, and ranges for different rows must be disjoint.
mallocServerFullCompliance	1.3.6.1.2.1.101.2.1.4			The compliance statement for multicast address allocation servers implementing the MALLOC MIB with support for read- create. Such servers can then be both monitored and configured with this MIB.
mallocServerGroup	1.3.6.1.2.1.101.2.2.2			A collection of objects providing management of multicast address allocation in servers.
mallocServerReadOnlyCompliance	1.3.6.1.2.1.101.2.1.1			The compliance statement for multicast address allocation servers implementing the MALLOC MIB without support for read-create (i.e., in read-only mode). Such a server can then be monitored but can not be configured with this MIB.

RFC description

Manages multicast address allocation including MADCAP client/server capabilities for IETF multicast address allocation.

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